fs/ext4/inline.c

   1 /*
   2  * Copyright (c) 2012 Taobao.
   3  * Written by Tao Ma <boyu.mt@taobao.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2.1 of the GNU Lesser General Public License
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include "ext4_jbd2.h"
  15 #include "ext4.h"
  16 #include "xattr.h"
  17 #include "truncate.h"
  18 #include <linux/fiemap.h>
  19
  20 #define EXT4_XATTR_SYSTEM_DATA  "data"
  21 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  22 #define EXT4_INLINE_DOTDOT_OFFSET       2
  23 #define EXT4_INLINE_DOTDOT_SIZE         4
  24
  25 static int ext4_get_inline_size(struct inode *inode)
  26 {
  27         if (EXT4_I(inode)->i_inline_off)
  28                 return EXT4_I(inode)->i_inline_size;
  29
  30         return 0;
  31 }
  32
  33 static int get_max_inline_xattr_value_size(struct inode *inode,
  34                                            struct ext4_iloc *iloc)
  35 {
  36         struct ext4_xattr_ibody_header *header;
  37         struct ext4_xattr_entry *entry;
  38         struct ext4_inode *raw_inode;
  39         int free, min_offs;
  40
  41         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  42                         EXT4_GOOD_OLD_INODE_SIZE -
  43                         EXT4_I(inode)->i_extra_isize -
  44                         sizeof(struct ext4_xattr_ibody_header);
  45
  46         /*
  47          * We need to subtract another sizeof(__u32) since an in-inode xattr
  48          * needs an empty 4 bytes to indicate the gap between the xattr entry
  49          * and the name/value pair.
  50          */
  51         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  52                 return EXT4_XATTR_SIZE(min_offs -
  53                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  54                         EXT4_XATTR_ROUND - sizeof(__u32));
  55
  56         raw_inode = ext4_raw_inode(iloc);
  57         header = IHDR(inode, raw_inode);
  58         entry = IFIRST(header);
  59
  60         /* Compute min_offs. */
  61         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  62                 if (!entry->e_value_block && entry->e_value_size) {
  63                         size_t offs = le16_to_cpu(entry->e_value_offs);
  64                         if (offs < min_offs)
  65                                 min_offs = offs;
  66                 }
  67         }
  68         free = min_offs -
  69                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  70
  71         if (EXT4_I(inode)->i_inline_off) {
  72                 entry = (struct ext4_xattr_entry *)
  73                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  74
  75                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  76                 goto out;
  77         }
  78
  79         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  80
  81         if (free > EXT4_XATTR_ROUND)
  82                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  83         else
  84                 free = 0;
  85
  86 out:
  87         return free;
  88 }
  89
  90 /*
  91  * Get the maximum size we now can store in an inode.
  92  * If we can't find the space for a xattr entry, don't use the space
  93  * of the extents since we have no space to indicate the inline data.
  94  */
  95 int ext4_get_max_inline_size(struct inode *inode)
  96 {
  97         int error, max_inline_size;
  98         struct ext4_iloc iloc;
  99
 100         if (EXT4_I(inode)->i_extra_isize == 0)
 101                 return 0;
 102
 103         error = ext4_get_inode_loc(inode, &iloc);
 104         if (error) {
 105                 ext4_error_inode(inode, __func__, __LINE__, 0,
 106                                  "can't get inode location %lu",
 107                                  inode->i_ino);
 108                 return 0;
 109         }
 110
 111         down_read(&EXT4_I(inode)->xattr_sem);
 112         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 113         up_read(&EXT4_I(inode)->xattr_sem);
 114
 115         brelse(iloc.bh);
 116
 117         if (!max_inline_size)
 118                 return 0;
 119
 120         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 121 }
 122
 123 int ext4_has_inline_data(struct inode *inode)
 124 {
 125         return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
 126                EXT4_I(inode)->i_inline_off;
 127 }
 128
 129 /*
 130  * this function does not take xattr_sem, which is OK because it is
 131  * currently only used in a code path coming form ext4_iget, before
 132  * the new inode has been unlocked
 133  */
 134 int ext4_find_inline_data_nolock(struct inode *inode)
 135 {
 136         struct ext4_xattr_ibody_find is = {
 137                 .s = { .not_found = -ENODATA, },
 138         };
 139         struct ext4_xattr_info i = {
 140                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 141                 .name = EXT4_XATTR_SYSTEM_DATA,
 142         };
 143         int error;
 144
 145         if (EXT4_I(inode)->i_extra_isize == 0)
 146                 return 0;
 147
 148         error = ext4_get_inode_loc(inode, &is.iloc);
 149         if (error)
 150                 return error;
 151
 152         error = ext4_xattr_ibody_find(inode, &i, &is);
 153         if (error)
 154                 goto out;
 155
 156         if (!is.s.not_found) {
 157                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 158                                         (void *)ext4_raw_inode(&is.iloc));
 159                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 160                                 le32_to_cpu(is.s.here->e_value_size);
 161                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 162         }
 163 out:
 164         brelse(is.iloc.bh);
 165         return error;
 166 }
 167
 168 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 169                                  unsigned int len,
 170                                  struct ext4_iloc *iloc)
 171 {
 172         struct ext4_xattr_entry *entry;
 173         struct ext4_xattr_ibody_header *header;
 174         int cp_len = 0;
 175         struct ext4_inode *raw_inode;
 176
 177         if (!len)
 178                 return 0;
 179
 180         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 181
 182         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 183                         len : EXT4_MIN_INLINE_DATA_SIZE;
 184
 185         raw_inode = ext4_raw_inode(iloc);
 186         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 187
 188         len -= cp_len;
 189         buffer += cp_len;
 190
 191         if (!len)
 192                 goto out;
 193
 194         header = IHDR(inode, raw_inode);
 195         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 196                                             EXT4_I(inode)->i_inline_off);
 197         len = min_t(unsigned int, len,
 198                     (unsigned int)le32_to_cpu(entry->e_value_size));
 199
 200         memcpy(buffer,
 201                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 202         cp_len += len;
 203
 204 out:
 205         return cp_len;
 206 }
 207
 208 /*
 209  * write the buffer to the inline inode.
 210  * If 'create' is set, we don't need to do the extra copy in the xattr
 211  * value since it is already handled by ext4_xattr_ibody_inline_set.
 212  * That saves us one memcpy.
 213  */
 214 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 215                                    void *buffer, loff_t pos, unsigned int len)
 216 {
 217         struct ext4_xattr_entry *entry;
 218         struct ext4_xattr_ibody_header *header;
 219         struct ext4_inode *raw_inode;
 220         int cp_len = 0;
 221
 222         BUG_ON(!EXT4_I(inode)->i_inline_off);
 223         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 224
 225         raw_inode = ext4_raw_inode(iloc);
 226         buffer += pos;
 227
 228         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 229                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 230                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 231                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 232
 233                 len -= cp_len;
 234                 buffer += cp_len;
 235                 pos += cp_len;
 236         }
 237
 238         if (!len)
 239                 return;
 240
 241         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 242         header = IHDR(inode, raw_inode);
 243         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 244                                             EXT4_I(inode)->i_inline_off);
 245
 246         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 247                buffer, len);
 248 }
 249
 250 static int ext4_create_inline_data(handle_t *handle,
 251                                    struct inode *inode, unsigned len)
 252 {
 253         int error;
 254         void *value = NULL;
 255         struct ext4_xattr_ibody_find is = {
 256                 .s = { .not_found = -ENODATA, },
 257         };
 258         struct ext4_xattr_info i = {
 259                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 260                 .name = EXT4_XATTR_SYSTEM_DATA,
 261         };
 262
 263         error = ext4_get_inode_loc(inode, &is.iloc);
 264         if (error)
 265                 return error;
 266
 267         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 268         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 269         if (error)
 270                 goto out;
 271
 272         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 273                 value = EXT4_ZERO_XATTR_VALUE;
 274                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 275         } else {
 276                 value = "";
 277                 len = 0;
 278         }
 279
 280         /* Insert the the xttr entry. */
 281         i.value = value;
 282         i.value_len = len;
 283
 284         error = ext4_xattr_ibody_find(inode, &i, &is);
 285         if (error)
 286                 goto out;
 287
 288         BUG_ON(!is.s.not_found);
 289
 290         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 291         if (error) {
 292                 if (error == -ENOSPC)
 293                         ext4_clear_inode_state(inode,
 294                                                EXT4_STATE_MAY_INLINE_DATA);
 295                 goto out;
 296         }
 297
 298         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 299                 0, EXT4_MIN_INLINE_DATA_SIZE);
 300
 301         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 302                                       (void *)ext4_raw_inode(&is.iloc));
 303         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 304         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 305         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 306         get_bh(is.iloc.bh);
 307         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 308
 309 out:
 310         brelse(is.iloc.bh);
 311         return error;
 312 }
 313
 314 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 315                                    unsigned int len)
 316 {
 317         int error;
 318         void *value = NULL;
 319         struct ext4_xattr_ibody_find is = {
 320                 .s = { .not_found = -ENODATA, },
 321         };
 322         struct ext4_xattr_info i = {
 323                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 324                 .name = EXT4_XATTR_SYSTEM_DATA,
 325         };
 326
 327         /* If the old space is ok, write the data directly. */
 328         if (len <= EXT4_I(inode)->i_inline_size)
 329                 return 0;
 330
 331         error = ext4_get_inode_loc(inode, &is.iloc);
 332         if (error)
 333                 return error;
 334
 335         error = ext4_xattr_ibody_find(inode, &i, &is);
 336         if (error)
 337                 goto out;
 338
 339         BUG_ON(is.s.not_found);
 340
 341         len -= EXT4_MIN_INLINE_DATA_SIZE;
 342         value = kzalloc(len, GFP_NOFS);
 343         if (!value)
 344                 goto out;
 345
 346         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 347                                      value, len);
 348         if (error == -ENODATA)
 349                 goto out;
 350
 351         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 352         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 353         if (error)
 354                 goto out;
 355
 356         /* Update the xttr entry. */
 357         i.value = value;
 358         i.value_len = len;
 359
 360         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 361         if (error)
 362                 goto out;
 363
 364         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 365                                       (void *)ext4_raw_inode(&is.iloc));
 366         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 367                                 le32_to_cpu(is.s.here->e_value_size);
 368         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 369         get_bh(is.iloc.bh);
 370         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 371
 372 out:
 373         kfree(value);
 374         brelse(is.iloc.bh);
 375         return error;
 376 }
 377
 378 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 379                                     unsigned int len)
 380 {
 381         int ret, size;
 382         struct ext4_inode_info *ei = EXT4_I(inode);
 383
 384         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 385                 return -ENOSPC;
 386
 387         size = ext4_get_max_inline_size(inode);
 388         if (size < len)
 389                 return -ENOSPC;
 390
 391         down_write(&EXT4_I(inode)->xattr_sem);
 392
 393         if (ei->i_inline_off)
 394                 ret = ext4_update_inline_data(handle, inode, len);
 395         else
 396                 ret = ext4_create_inline_data(handle, inode, len);
 397
 398         up_write(&EXT4_I(inode)->xattr_sem);
 399
 400         return ret;
 401 }
 402
 403 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 404                                            struct inode *inode)
 405 {
 406         struct ext4_inode_info *ei = EXT4_I(inode);
 407         struct ext4_xattr_ibody_find is = {
 408                 .s = { .not_found = 0, },
 409         };
 410         struct ext4_xattr_info i = {
 411                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 412                 .name = EXT4_XATTR_SYSTEM_DATA,
 413                 .value = NULL,
 414                 .value_len = 0,
 415         };
 416         int error;
 417
 418         if (!ei->i_inline_off)
 419                 return 0;
 420
 421         error = ext4_get_inode_loc(inode, &is.iloc);
 422         if (error)
 423                 return error;
 424
 425         error = ext4_xattr_ibody_find(inode, &i, &is);
 426         if (error)
 427                 goto out;
 428
 429         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 430         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 431         if (error)
 432                 goto out;
 433
 434         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 435         if (error)
 436                 goto out;
 437
 438         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 439                 0, EXT4_MIN_INLINE_DATA_SIZE);
 440
 441         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
 442                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 443                 if (S_ISDIR(inode->i_mode) ||
 444                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 445                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 446                         ext4_ext_tree_init(handle, inode);
 447                 }
 448         }
 449         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 450
 451         get_bh(is.iloc.bh);
 452         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 453
 454         EXT4_I(inode)->i_inline_off = 0;
 455         EXT4_I(inode)->i_inline_size = 0;
 456         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 457 out:
 458         brelse(is.iloc.bh);
 459         if (error == -ENODATA)
 460                 error = 0;
 461         return error;
 462 }
 463
 464 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 465 {
 466         void *kaddr;
 467         int ret = 0;
 468         size_t len;
 469         struct ext4_iloc iloc;
 470
 471         BUG_ON(!PageLocked(page));
 472         BUG_ON(!ext4_has_inline_data(inode));
 473         BUG_ON(page->index);
 474
 475         if (!EXT4_I(inode)->i_inline_off) {
 476                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 477                              inode->i_ino);
 478                 goto out;
 479         }
 480
 481         ret = ext4_get_inode_loc(inode, &iloc);
 482         if (ret)
 483                 goto out;
 484
 485         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 486         kaddr = kmap_atomic(page);
 487         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 488         flush_dcache_page(page);
 489         kunmap_atomic(kaddr);
 490         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 491         SetPageUptodate(page);
 492         brelse(iloc.bh);
 493
 494 out:
 495         return ret;
 496 }
 497
 498 int ext4_readpage_inline(struct inode *inode, struct page *page)
 499 {
 500         int ret = 0;
 501
 502         down_read(&EXT4_I(inode)->xattr_sem);
 503         if (!ext4_has_inline_data(inode)) {
 504                 up_read(&EXT4_I(inode)->xattr_sem);
 505                 return -EAGAIN;
 506         }
 507
 508         /*
 509          * Current inline data can only exist in the 1st page,
 510          * So for all the other pages, just set them uptodate.
 511          */
 512         if (!page->index)
 513                 ret = ext4_read_inline_page(inode, page);
 514         else if (!PageUptodate(page)) {
 515                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 516                 SetPageUptodate(page);
 517         }
 518
 519         up_read(&EXT4_I(inode)->xattr_sem);
 520
 521         unlock_page(page);
 522         return ret >= 0 ? 0 : ret;
 523 }
 524
 525 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 526                                               struct inode *inode,
 527                                               unsigned flags)
 528 {
 529         int ret, needed_blocks;
 530         handle_t *handle = NULL;
 531         int retries = 0, sem_held = 0;
 532         struct page *page = NULL;
 533         unsigned from, to;
 534         struct ext4_iloc iloc;
 535
 536         if (!ext4_has_inline_data(inode)) {
 537                 /*
 538                  * clear the flag so that no new write
 539                  * will trap here again.
 540                  */
 541                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 542                 return 0;
 543         }
 544
 545         needed_blocks = ext4_writepage_trans_blocks(inode);
 546
 547         ret = ext4_get_inode_loc(inode, &iloc);
 548         if (ret)
 549                 return ret;
 550
 551 retry:
 552         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 553         if (IS_ERR(handle)) {
 554                 ret = PTR_ERR(handle);
 555                 handle = NULL;
 556                 goto out;
 557         }
 558
 559         /* We cannot recurse into the filesystem as the transaction is already
 560          * started */
 561         flags |= AOP_FLAG_NOFS;
 562
 563         page = grab_cache_page_write_begin(mapping, 0, flags);
 564         if (!page) {
 565                 ret = -ENOMEM;
 566                 goto out;
 567         }
 568
 569         down_write(&EXT4_I(inode)->xattr_sem);
 570         sem_held = 1;
 571         /* If some one has already done this for us, just exit. */
 572         if (!ext4_has_inline_data(inode)) {
 573                 ret = 0;
 574                 goto out;
 575         }
 576
 577         from = 0;
 578         to = ext4_get_inline_size(inode);
 579         if (!PageUptodate(page)) {
 580                 ret = ext4_read_inline_page(inode, page);
 581                 if (ret < 0)
 582                         goto out;
 583         }
 584
 585         ret = ext4_destroy_inline_data_nolock(handle, inode);
 586         if (ret)
 587                 goto out;
 588
 589         if (ext4_should_dioread_nolock(inode))
 590                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 591         else
 592                 ret = __block_write_begin(page, from, to, ext4_get_block);
 593
 594         if (!ret && ext4_should_journal_data(inode)) {
 595                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 596                                              from, to, NULL,
 597                                              do_journal_get_write_access);
 598         }
 599
 600         if (ret) {
 601                 unlock_page(page);
 602                 page_cache_release(page);
 603                 ext4_orphan_add(handle, inode);
 604                 up_write(&EXT4_I(inode)->xattr_sem);
 605                 sem_held = 0;
 606                 ext4_journal_stop(handle);
 607                 handle = NULL;
 608                 ext4_truncate_failed_write(inode);
 609                 /*
 610                  * If truncate failed early the inode might
 611                  * still be on the orphan list; we need to
 612                  * make sure the inode is removed from the
 613                  * orphan list in that case.
 614                  */
 615                 if (inode->i_nlink)
 616                         ext4_orphan_del(NULL, inode);
 617         }
 618
 619         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 620                 goto retry;
 621
 622         block_commit_write(page, from, to);
 623 out:
 624         if (page) {
 625                 unlock_page(page);
 626                 page_cache_release(page);
 627         }
 628         if (sem_held)
 629                 up_write(&EXT4_I(inode)->xattr_sem);
 630         if (handle)
 631                 ext4_journal_stop(handle);
 632         brelse(iloc.bh);
 633         return ret;
 634 }
 635
 636 /*
 637  * Try to write data in the inode.
 638  * If the inode has inline data, check whether the new write can be
 639  * in the inode also. If not, create the page the handle, move the data
 640  * to the page make it update and let the later codes create extent for it.
 641  */
 642 int ext4_try_to_write_inline_data(struct address_space *mapping,
 643                                   struct inode *inode,
 644                                   loff_t pos, unsigned len,
 645                                   unsigned flags,
 646                                   struct page **pagep)
 647 {
 648         int ret;
 649         handle_t *handle;
 650         struct page *page;
 651         struct ext4_iloc iloc;
 652
 653         if (pos + len > ext4_get_max_inline_size(inode))
 654                 goto convert;
 655
 656         ret = ext4_get_inode_loc(inode, &iloc);
 657         if (ret)
 658                 return ret;
 659
 660         /*
 661          * The possible write could happen in the inode,
 662          * so try to reserve the space in inode first.
 663          */
 664         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 665         if (IS_ERR(handle)) {
 666                 ret = PTR_ERR(handle);
 667                 handle = NULL;
 668                 goto out;
 669         }
 670
 671         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 672         if (ret && ret != -ENOSPC)
 673                 goto out;
 674
 675         /* We don't have space in inline inode, so convert it to extent. */
 676         if (ret == -ENOSPC) {
 677                 ext4_journal_stop(handle);
 678                 brelse(iloc.bh);
 679                 goto convert;
 680         }
 681
 682         flags |= AOP_FLAG_NOFS;
 683
 684         page = grab_cache_page_write_begin(mapping, 0, flags);
 685         if (!page) {
 686                 ret = -ENOMEM;
 687                 goto out;
 688         }
 689
 690         *pagep = page;
 691         down_read(&EXT4_I(inode)->xattr_sem);
 692         if (!ext4_has_inline_data(inode)) {
 693                 ret = 0;
 694                 unlock_page(page);
 695                 page_cache_release(page);
 696                 goto out_up_read;
 697         }
 698
 699         if (!PageUptodate(page)) {
 700                 ret = ext4_read_inline_page(inode, page);
 701                 if (ret < 0)
 702                         goto out_up_read;
 703         }
 704
 705         ret = 1;
 706         handle = NULL;
 707 out_up_read:
 708         up_read(&EXT4_I(inode)->xattr_sem);
 709 out:
 710         if (handle)
 711                 ext4_journal_stop(handle);
 712         brelse(iloc.bh);
 713         return ret;
 714 convert:
 715         return ext4_convert_inline_data_to_extent(mapping,
 716                                                   inode, flags);
 717 }
 718
 719 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 720                                unsigned copied, struct page *page)
 721 {
 722         int ret;
 723         void *kaddr;
 724         struct ext4_iloc iloc;
 725
 726         if (unlikely(copied < len)) {
 727                 if (!PageUptodate(page)) {
 728                         copied = 0;
 729                         goto out;
 730                 }
 731         }
 732
 733         ret = ext4_get_inode_loc(inode, &iloc);
 734         if (ret) {
 735                 ext4_std_error(inode->i_sb, ret);
 736                 copied = 0;
 737                 goto out;
 738         }
 739
 740         down_write(&EXT4_I(inode)->xattr_sem);
 741         BUG_ON(!ext4_has_inline_data(inode));
 742
 743         kaddr = kmap_atomic(page);
 744         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 745         kunmap_atomic(kaddr);
 746         SetPageUptodate(page);
 747         /* clear page dirty so that writepages wouldn't work for us. */
 748         ClearPageDirty(page);
 749
 750         up_write(&EXT4_I(inode)->xattr_sem);
 751         brelse(iloc.bh);
 752 out:
 753         return copied;
 754 }
 755
 756 struct buffer_head *
 757 ext4_journalled_write_inline_data(struct inode *inode,
 758                                   unsigned len,
 759                                   struct page *page)
 760 {
 761         int ret;
 762         void *kaddr;
 763         struct ext4_iloc iloc;
 764
 765         ret = ext4_get_inode_loc(inode, &iloc);
 766         if (ret) {
 767                 ext4_std_error(inode->i_sb, ret);
 768                 return NULL;
 769         }
 770
 771         down_write(&EXT4_I(inode)->xattr_sem);
 772         kaddr = kmap_atomic(page);
 773         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 774         kunmap_atomic(kaddr);
 775         up_write(&EXT4_I(inode)->xattr_sem);
 776
 777         return iloc.bh;
 778 }
 779
 780 /*
 781  * Try to make the page cache and handle ready for the inline data case.
 782  * We can call this function in 2 cases:
 783  * 1. The inode is created and the first write exceeds inline size. We can
 784  *    clear the inode state safely.
 785  * 2. The inode has inline data, then we need to read the data, make it
 786  *    update and dirty so that ext4_da_writepages can handle it. We don't
 787  *    need to start the journal since the file's metatdata isn't changed now.
 788  */
 789 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 790                                                  struct inode *inode,
 791                                                  unsigned flags,
 792                                                  void **fsdata)
 793 {
 794         int ret = 0, inline_size;
 795         struct page *page;
 796
 797         page = grab_cache_page_write_begin(mapping, 0, flags);
 798         if (!page)
 799                 return -ENOMEM;
 800
 801         down_read(&EXT4_I(inode)->xattr_sem);
 802         if (!ext4_has_inline_data(inode)) {
 803                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 804                 goto out;
 805         }
 806
 807         inline_size = ext4_get_inline_size(inode);
 808
 809         if (!PageUptodate(page)) {
 810                 ret = ext4_read_inline_page(inode, page);
 811                 if (ret < 0)
 812                         goto out;
 813         }
 814
 815         ret = __block_write_begin(page, 0, inline_size,
 816                                   ext4_da_get_block_prep);
 817         if (ret) {
 818                 ext4_truncate_failed_write(inode);
 819                 goto out;
 820         }
 821
 822         SetPageDirty(page);
 823         SetPageUptodate(page);
 824         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 825         *fsdata = (void *)CONVERT_INLINE_DATA;
 826
 827 out:
 828         up_read(&EXT4_I(inode)->xattr_sem);
 829         if (page) {
 830                 unlock_page(page);
 831                 page_cache_release(page);
 832         }
 833         return ret;
 834 }
 835
 836 /*
 837  * Prepare the write for the inline data.
 838  * If the the data can be written into the inode, we just read
 839  * the page and make it uptodate, and start the journal.
 840  * Otherwise read the page, makes it dirty so that it can be
 841  * handle in writepages(the i_disksize update is left to the
 842  * normal ext4_da_write_end).
 843  */
 844 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 845                                     struct inode *inode,
 846                                     loff_t pos, unsigned len,
 847                                     unsigned flags,
 848                                     struct page **pagep,
 849                                     void **fsdata)
 850 {
 851         int ret, inline_size;
 852         handle_t *handle;
 853         struct page *page;
 854         struct ext4_iloc iloc;
 855         int retries;
 856
 857         ret = ext4_get_inode_loc(inode, &iloc);
 858         if (ret)
 859                 return ret;
 860
 861 retry_journal:
 862         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 863         if (IS_ERR(handle)) {
 864                 ret = PTR_ERR(handle);
 865                 goto out;
 866         }
 867
 868         inline_size = ext4_get_max_inline_size(inode);
 869
 870         ret = -ENOSPC;
 871         if (inline_size >= pos + len) {
 872                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 873                 if (ret && ret != -ENOSPC)
 874                         goto out_journal;
 875         }
 876
 877         if (ret == -ENOSPC) {
 878                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 879                                                             inode,
 880                                                             flags,
 881                                                             fsdata);
 882                 ext4_journal_stop(handle);
 883                 if (ret == -ENOSPC &&
 884                     ext4_should_retry_alloc(inode->i_sb, &retries))
 885                         goto retry_journal;
 886                 goto out;
 887         }
 888
 889         /*
 890          * We cannot recurse into the filesystem as the transaction
 891          * is already started.
 892          */
 893         flags |= AOP_FLAG_NOFS;
 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         page_cache_release(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
 934         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 935
 936         /*
 937          * No need to use i_size_read() here, the i_size
 938          * cannot change under us because we hold i_mutex.
 939          *
 940          * But it's important to update i_size while still holding page lock:
 941          * page writeout could otherwise come in and zero beyond i_size.
 942          */
 943         if (pos+copied > inode->i_size) {
 944                 i_size_write(inode, pos+copied);
 945                 i_size_changed = 1;
 946         }
 947         unlock_page(page);
 948         page_cache_release(page);
 949
 950         /*
 951          * Don't mark the inode dirty under page lock. First, it unnecessarily
 952          * makes the holding time of page lock longer. Second, it forces lock
 953          * ordering of page lock and transaction start for journaling
 954          * filesystems.
 955          */
 956         if (i_size_changed)
 957                 mark_inode_dirty(inode);
 958
 959         return copied;
 960 }
 961
 962 #ifdef INLINE_DIR_DEBUG
 963 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 964                           void *inline_start, int inline_size)
 965 {
 966         int offset;
 967         unsigned short de_len;
 968         struct ext4_dir_entry_2 *de = inline_start;
 969         void *dlimit = inline_start + inline_size;
 970
 971         trace_printk("inode %lu\n", dir->i_ino);
 972         offset = 0;
 973         while ((void *)de < dlimit) {
 974                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 975                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
 976                              offset, de_len, de->name_len, de->name,
 977                              de->name_len, le32_to_cpu(de->inode));
 978                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 979                                          inline_start, inline_size, offset))
 980                         BUG();
 981
 982                 offset += de_len;
 983                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 984         }
 985 }
 986 #else
 987 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 988 #endif
 989
 990 /*
 991  * Add a new entry into a inline dir.
 992  * It will return -ENOSPC if no space is available, and -EIO
 993  * and -EEXIST if directory entry already exists.
 994  */
 995 static int ext4_add_dirent_to_inline(handle_t *handle,
 996                                      struct dentry *dentry,
 997                                      struct inode *inode,
 998                                      struct ext4_iloc *iloc,
 999                                      void *inline_start, int inline_size)
1000 {
1001         struct inode    *dir = dentry->d_parent->d_inode;
1002         const char      *name = dentry->d_name.name;
1003         int             namelen = dentry->d_name.len;
1004         int             err;
1005         struct ext4_dir_entry_2 *de;
1006
1007         err = ext4_find_dest_de(dir, inode, iloc->bh,
1008                                 inline_start, inline_size,
1009                                 name, namelen, &de);
1010         if (err)
1011                 return err;
1012
1013         BUFFER_TRACE(iloc->bh, "get_write_access");
1014         err = ext4_journal_get_write_access(handle, iloc->bh);
1015         if (err)
1016                 return err;
1017         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1018
1019         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1020
1021         /*
1022          * XXX shouldn't update any times until successful
1023          * completion of syscall, but too many callers depend
1024          * on this.
1025          *
1026          * XXX similarly, too many callers depend on
1027          * ext4_new_inode() setting the times, but error
1028          * recovery deletes the inode, so the worst that can
1029          * happen is that the times are slightly out of date
1030          * and/or different from the directory change time.
1031          */
1032         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1033         ext4_update_dx_flag(dir);
1034         dir->i_version++;
1035         ext4_mark_inode_dirty(handle, dir);
1036         return 1;
1037 }
1038
1039 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1040                                        struct ext4_iloc *iloc)
1041 {
1042         struct ext4_xattr_entry *entry;
1043         struct ext4_xattr_ibody_header *header;
1044
1045         BUG_ON(!EXT4_I(inode)->i_inline_off);
1046
1047         header = IHDR(inode, ext4_raw_inode(iloc));
1048         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1049                                             EXT4_I(inode)->i_inline_off);
1050
1051         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1052 }
1053
1054 /* Set the final de to cover the whole block. */
1055 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1056 {
1057         struct ext4_dir_entry_2 *de, *prev_de;
1058         void *limit;
1059         int de_len;
1060
1061         de = (struct ext4_dir_entry_2 *)de_buf;
1062         if (old_size) {
1063                 limit = de_buf + old_size;
1064                 do {
1065                         prev_de = de;
1066                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1067                         de_buf += de_len;
1068                         de = (struct ext4_dir_entry_2 *)de_buf;
1069                 } while (de_buf < limit);
1070
1071                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1072                                                         old_size, new_size);
1073         } else {
1074                 /* this is just created, so create an empty entry. */
1075                 de->inode = 0;
1076                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1077         }
1078 }
1079
1080 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1081                                   struct ext4_iloc *iloc)
1082 {
1083         int ret;
1084         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1085         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1086
1087         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1088                 return -ENOSPC;
1089
1090         ret = ext4_update_inline_data(handle, dir,
1091                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1092         if (ret)
1093                 return ret;
1094
1095         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1096                              EXT4_I(dir)->i_inline_size -
1097                                                 EXT4_MIN_INLINE_DATA_SIZE);
1098         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1099         return 0;
1100 }
1101
1102 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1103                                      struct ext4_iloc *iloc,
1104                                      void *buf, int inline_size)
1105 {
1106         ext4_create_inline_data(handle, inode, inline_size);
1107         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1108         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1109 }
1110
1111 static int ext4_finish_convert_inline_dir(handle_t *handle,
1112                                           struct inode *inode,
1113                                           struct buffer_head *dir_block,
1114                                           void *buf,
1115                                           int inline_size)
1116 {
1117         int err, csum_size = 0, header_size = 0;
1118         struct ext4_dir_entry_2 *de;
1119         struct ext4_dir_entry_tail *t;
1120         void *target = dir_block->b_data;
1121
1122         /*
1123          * First create "." and ".." and then copy the dir information
1124          * back to the block.
1125          */
1126         de = (struct ext4_dir_entry_2 *)target;
1127         de = ext4_init_dot_dotdot(inode, de,
1128                 inode->i_sb->s_blocksize, csum_size,
1129                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1130         header_size = (void *)de - target;
1131
1132         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1133                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1134
1135         if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1136                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1137                 csum_size = sizeof(struct ext4_dir_entry_tail);
1138
1139         inode->i_size = inode->i_sb->s_blocksize;
1140         i_size_write(inode, inode->i_sb->s_blocksize);
1141         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1142         ext4_update_final_de(dir_block->b_data,
1143                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1144                         inode->i_sb->s_blocksize - csum_size);
1145
1146         if (csum_size) {
1147                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1148                                      inode->i_sb->s_blocksize);
1149                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1150         }
1151         set_buffer_uptodate(dir_block);
1152         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1153         if (err)
1154                 goto out;
1155         set_buffer_verified(dir_block);
1156 out:
1157         return err;
1158 }
1159
1160 static int ext4_convert_inline_data_nolock(handle_t *handle,
1161                                            struct inode *inode,
1162                                            struct ext4_iloc *iloc)
1163 {
1164         int error;
1165         void *buf = NULL;
1166         struct buffer_head *data_bh = NULL;
1167         struct ext4_map_blocks map;
1168         int inline_size;
1169
1170         inline_size = ext4_get_inline_size(inode);
1171         buf = kmalloc(inline_size, GFP_NOFS);
1172         if (!buf) {
1173                 error = -ENOMEM;
1174                 goto out;
1175         }
1176
1177         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1178         if (error < 0)
1179                 goto out;
1180
1181         error = ext4_destroy_inline_data_nolock(handle, inode);
1182         if (error)
1183                 goto out;
1184
1185         map.m_lblk = 0;
1186         map.m_len = 1;
1187         map.m_flags = 0;
1188         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1189         if (error < 0)
1190                 goto out_restore;
1191         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1192                 error = -EIO;
1193                 goto out_restore;
1194         }
1195
1196         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1197         if (!data_bh) {
1198                 error = -ENOMEM;
1199                 goto out_restore;
1200         }
1201
1202         lock_buffer(data_bh);
1203         error = ext4_journal_get_create_access(handle, data_bh);
1204         if (error) {
1205                 unlock_buffer(data_bh);
1206                 error = -EIO;
1207                 goto out_restore;
1208         }
1209         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1210
1211         if (!S_ISDIR(inode->i_mode)) {
1212                 memcpy(data_bh->b_data, buf, inline_size);
1213                 set_buffer_uptodate(data_bh);
1214                 error = ext4_handle_dirty_metadata(handle,
1215                                                    inode, data_bh);
1216         } else {
1217                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1218                                                        buf, inline_size);
1219         }
1220
1221         unlock_buffer(data_bh);
1222 out_restore:
1223         if (error)
1224                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1225
1226 out:
1227         brelse(data_bh);
1228         kfree(buf);
1229         return error;
1230 }
1231
1232 /*
1233  * Try to add the new entry to the inline data.
1234  * If succeeds, return 0. If not, extended the inline dir and copied data to
1235  * the new created block.
1236  */
1237 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1238                               struct inode *inode)
1239 {
1240         int ret, inline_size;
1241         void *inline_start;
1242         struct ext4_iloc iloc;
1243         struct inode *dir = dentry->d_parent->d_inode;
1244
1245         ret = ext4_get_inode_loc(dir, &iloc);
1246         if (ret)
1247                 return ret;
1248
1249         down_write(&EXT4_I(dir)->xattr_sem);
1250         if (!ext4_has_inline_data(dir))
1251                 goto out;
1252
1253         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1254                                                  EXT4_INLINE_DOTDOT_SIZE;
1255         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1256
1257         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1258                                         inline_start, inline_size);
1259         if (ret != -ENOSPC)
1260                 goto out;
1261
1262         /* check whether it can be inserted to inline xattr space. */
1263         inline_size = EXT4_I(dir)->i_inline_size -
1264                         EXT4_MIN_INLINE_DATA_SIZE;
1265         if (!inline_size) {
1266                 /* Try to use the xattr space.*/
1267                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1268                 if (ret && ret != -ENOSPC)
1269                         goto out;
1270
1271                 inline_size = EXT4_I(dir)->i_inline_size -
1272                                 EXT4_MIN_INLINE_DATA_SIZE;
1273         }
1274
1275         if (inline_size) {
1276                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1277
1278                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1279                                                 inline_start, inline_size);
1280
1281                 if (ret != -ENOSPC)
1282                         goto out;
1283         }
1284
1285         /*
1286          * The inline space is filled up, so create a new block for it.
1287          * As the extent tree will be created, we have to save the inline
1288          * dir first.
1289          */
1290         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1291
1292 out:
1293         ext4_mark_inode_dirty(handle, dir);
1294         up_write(&EXT4_I(dir)->xattr_sem);
1295         brelse(iloc.bh);
1296         return ret;
1297 }
1298
1299 /*
1300  * This function fills a red-black tree with information from an
1301  * inlined dir.  It returns the number directory entries loaded
1302  * into the tree.  If there is an error it is returned in err.
1303  */
1304 int htree_inlinedir_to_tree(struct file *dir_file,
1305                             struct inode *dir, ext4_lblk_t block,
1306                             struct dx_hash_info *hinfo,
1307                             __u32 start_hash, __u32 start_minor_hash,
1308                             int *has_inline_data)
1309 {
1310         int err = 0, count = 0;
1311         unsigned int parent_ino;
1312         int pos;
1313         struct ext4_dir_entry_2 *de;
1314         struct inode *inode = file_inode(dir_file);
1315         int ret, inline_size = 0;
1316         struct ext4_iloc iloc;
1317         void *dir_buf = NULL;
1318         struct ext4_dir_entry_2 fake;
1319
1320         ret = ext4_get_inode_loc(inode, &iloc);
1321         if (ret)
1322                 return ret;
1323
1324         down_read(&EXT4_I(inode)->xattr_sem);
1325         if (!ext4_has_inline_data(inode)) {
1326                 up_read(&EXT4_I(inode)->xattr_sem);
1327                 *has_inline_data = 0;
1328                 goto out;
1329         }
1330
1331         inline_size = ext4_get_inline_size(inode);
1332         dir_buf = kmalloc(inline_size, GFP_NOFS);
1333         if (!dir_buf) {
1334                 ret = -ENOMEM;
1335                 up_read(&EXT4_I(inode)->xattr_sem);
1336                 goto out;
1337         }
1338
1339         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1340         up_read(&EXT4_I(inode)->xattr_sem);
1341         if (ret < 0)
1342                 goto out;
1343
1344         pos = 0;
1345         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1346         while (pos < inline_size) {
1347                 /*
1348                  * As inlined dir doesn't store any information about '.' and
1349                  * only the inode number of '..' is stored, we have to handle
1350                  * them differently.
1351                  */
1352                 if (pos == 0) {
1353                         fake.inode = cpu_to_le32(inode->i_ino);
1354                         fake.name_len = 1;
1355                         strcpy(fake.name, ".");
1356                         fake.rec_len = ext4_rec_len_to_disk(
1357                                                 EXT4_DIR_REC_LEN(fake.name_len),
1358                                                 inline_size);
1359                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1360                         de = &fake;
1361                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1362                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1363                         fake.inode = cpu_to_le32(parent_ino);
1364                         fake.name_len = 2;
1365                         strcpy(fake.name, "..");
1366                         fake.rec_len = ext4_rec_len_to_disk(
1367                                                 EXT4_DIR_REC_LEN(fake.name_len),
1368                                                 inline_size);
1369                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1370                         de = &fake;
1371                         pos = EXT4_INLINE_DOTDOT_SIZE;
1372                 } else {
1373                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1374                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1375                         if (ext4_check_dir_entry(inode, dir_file, de,
1376                                          iloc.bh, dir_buf,
1377                                          inline_size, pos)) {
1378                                 ret = count;
1379                                 goto out;
1380                         }
1381                 }
1382
1383                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1384                 if ((hinfo->hash < start_hash) ||
1385                     ((hinfo->hash == start_hash) &&
1386                      (hinfo->minor_hash < start_minor_hash)))
1387                         continue;
1388                 if (de->inode == 0)
1389                         continue;
1390                 err = ext4_htree_store_dirent(dir_file,
1391                                    hinfo->hash, hinfo->minor_hash, de);
1392                 if (err) {
1393                         count = err;
1394                         goto out;
1395                 }
1396                 count++;
1397         }
1398         ret = count;
1399 out:
1400         kfree(dir_buf);
1401         brelse(iloc.bh);
1402         return ret;
1403 }
1404
1405 /*
1406  * So this function is called when the volume is mkfsed with
1407  * dir_index disabled. In order to keep f_pos persistent
1408  * after we convert from an inlined dir to a blocked based,
1409  * we just pretend that we are a normal dir and return the
1410  * offset as if '.' and '..' really take place.
1411  *
1412  */
1413 int ext4_read_inline_dir(struct file *file,
1414                          struct dir_context *ctx,
1415                          int *has_inline_data)
1416 {
1417         unsigned int offset, parent_ino;
1418         int i;
1419         struct ext4_dir_entry_2 *de;
1420         struct super_block *sb;
1421         struct inode *inode = file_inode(file);
1422         int ret, inline_size = 0;
1423         struct ext4_iloc iloc;
1424         void *dir_buf = NULL;
1425         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1426
1427         ret = ext4_get_inode_loc(inode, &iloc);
1428         if (ret)
1429                 return ret;
1430
1431         down_read(&EXT4_I(inode)->xattr_sem);
1432         if (!ext4_has_inline_data(inode)) {
1433                 up_read(&EXT4_I(inode)->xattr_sem);
1434                 *has_inline_data = 0;
1435                 goto out;
1436         }
1437
1438         inline_size = ext4_get_inline_size(inode);
1439         dir_buf = kmalloc(inline_size, GFP_NOFS);
1440         if (!dir_buf) {
1441                 ret = -ENOMEM;
1442                 up_read(&EXT4_I(inode)->xattr_sem);
1443                 goto out;
1444         }
1445
1446         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1447         up_read(&EXT4_I(inode)->xattr_sem);
1448         if (ret < 0)
1449                 goto out;
1450
1451         ret = 0;
1452         sb = inode->i_sb;
1453         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1454         offset = ctx->pos;
1455
1456         /*
1457          * dotdot_offset and dotdot_size is the real offset and
1458          * size for ".." and "." if the dir is block based while
1459          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1460          * So we will use extra_offset and extra_size to indicate them
1461          * during the inline dir iteration.
1462          */
1463         dotdot_offset = EXT4_DIR_REC_LEN(1);
1464         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1465         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1466         extra_size = extra_offset + inline_size;
1467
1468         /*
1469          * If the version has changed since the last call to
1470          * readdir(2), then we might be pointing to an invalid
1471          * dirent right now.  Scan from the start of the inline
1472          * dir to make sure.
1473          */
1474         if (file->f_version != inode->i_version) {
1475                 for (i = 0; i < extra_size && i < offset;) {
1476                         /*
1477                          * "." is with offset 0 and
1478                          * ".." is dotdot_offset.
1479                          */
1480                         if (!i) {
1481                                 i = dotdot_offset;
1482                                 continue;
1483                         } else if (i == dotdot_offset) {
1484                                 i = dotdot_size;
1485                                 continue;
1486                         }
1487                         /* for other entry, the real offset in
1488                          * the buf has to be tuned accordingly.
1489                          */
1490                         de = (struct ext4_dir_entry_2 *)
1491                                 (dir_buf + i - extra_offset);
1492                         /* It's too expensive to do a full
1493                          * dirent test each time round this
1494                          * loop, but we do have to test at
1495                          * least that it is non-zero.  A
1496                          * failure will be detected in the
1497                          * dirent test below. */
1498                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1499                                 < EXT4_DIR_REC_LEN(1))
1500                                 break;
1501                         i += ext4_rec_len_from_disk(de->rec_len,
1502                                                     extra_size);
1503                 }
1504                 offset = i;
1505                 ctx->pos = offset;
1506                 file->f_version = inode->i_version;
1507         }
1508
1509         while (ctx->pos < extra_size) {
1510                 if (ctx->pos == 0) {
1511                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1512                                 goto out;
1513                         ctx->pos = dotdot_offset;
1514                         continue;
1515                 }
1516
1517                 if (ctx->pos == dotdot_offset) {
1518                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1519                                 goto out;
1520                         ctx->pos = dotdot_size;
1521                         continue;
1522                 }
1523
1524                 de = (struct ext4_dir_entry_2 *)
1525                         (dir_buf + ctx->pos - extra_offset);
1526                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1527                                          extra_size, ctx->pos))
1528                         goto out;
1529                 if (le32_to_cpu(de->inode)) {
1530                         if (!dir_emit(ctx, de->name, de->name_len,
1531                                       le32_to_cpu(de->inode),
1532                                       get_dtype(sb, de->file_type)))
1533                                 goto out;
1534                 }
1535                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1536         }
1537 out:
1538         kfree(dir_buf);
1539         brelse(iloc.bh);
1540         return ret;
1541 }
1542
1543 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1544                                         struct ext4_dir_entry_2 **parent_de,
1545                                         int *retval)
1546 {
1547         struct ext4_iloc iloc;
1548
1549         *retval = ext4_get_inode_loc(inode, &iloc);
1550         if (*retval)
1551                 return NULL;
1552
1553         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1554
1555         return iloc.bh;
1556 }
1557
1558 /*
1559  * Try to create the inline data for the new dir.
1560  * If it succeeds, return 0, otherwise return the error.
1561  * In case of ENOSPC, the caller should create the normal disk layout dir.
1562  */
1563 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1564                                struct inode *inode)
1565 {
1566         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1567         struct ext4_iloc iloc;
1568         struct ext4_dir_entry_2 *de;
1569
1570         ret = ext4_get_inode_loc(inode, &iloc);
1571         if (ret)
1572                 return ret;
1573
1574         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1575         if (ret)
1576                 goto out;
1577
1578         /*
1579          * For inline dir, we only save the inode information for the ".."
1580          * and create a fake dentry to cover the left space.
1581          */
1582         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1583         de->inode = cpu_to_le32(parent->i_ino);
1584         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1585         de->inode = 0;
1586         de->rec_len = ext4_rec_len_to_disk(
1587                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1588                                 inline_size);
1589         set_nlink(inode, 2);
1590         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1591 out:
1592         brelse(iloc.bh);
1593         return ret;
1594 }
1595
1596 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1597                                         const struct qstr *d_name,
1598                                         struct ext4_dir_entry_2 **res_dir,
1599                                         int *has_inline_data)
1600 {
1601         int ret;
1602         struct ext4_iloc iloc;
1603         void *inline_start;
1604         int inline_size;
1605
1606         if (ext4_get_inode_loc(dir, &iloc))
1607                 return NULL;
1608
1609         down_read(&EXT4_I(dir)->xattr_sem);
1610         if (!ext4_has_inline_data(dir)) {
1611                 *has_inline_data = 0;
1612                 goto out;
1613         }
1614
1615         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1616                                                 EXT4_INLINE_DOTDOT_SIZE;
1617         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1618         ret = search_dir(iloc.bh, inline_start, inline_size,
1619                          dir, d_name, 0, res_dir);
1620         if (ret == 1)
1621                 goto out_find;
1622         if (ret < 0)
1623                 goto out;
1624
1625         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1626                 goto out;
1627
1628         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1629         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1630
1631         ret = search_dir(iloc.bh, inline_start, inline_size,
1632                          dir, d_name, 0, res_dir);
1633         if (ret == 1)
1634                 goto out_find;
1635
1636 out:
1637         brelse(iloc.bh);
1638         iloc.bh = NULL;
1639 out_find:
1640         up_read(&EXT4_I(dir)->xattr_sem);
1641         return iloc.bh;
1642 }
1643
1644 int ext4_delete_inline_entry(handle_t *handle,
1645                              struct inode *dir,
1646                              struct ext4_dir_entry_2 *de_del,
1647                              struct buffer_head *bh,
1648                              int *has_inline_data)
1649 {
1650         int err, inline_size;
1651         struct ext4_iloc iloc;
1652         void *inline_start;
1653
1654         err = ext4_get_inode_loc(dir, &iloc);
1655         if (err)
1656                 return err;
1657
1658         down_write(&EXT4_I(dir)->xattr_sem);
1659         if (!ext4_has_inline_data(dir)) {
1660                 *has_inline_data = 0;
1661                 goto out;
1662         }
1663
1664         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1665                 EXT4_MIN_INLINE_DATA_SIZE) {
1666                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1667                                         EXT4_INLINE_DOTDOT_SIZE;
1668                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1669                                 EXT4_INLINE_DOTDOT_SIZE;
1670         } else {
1671                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1672                 inline_size = ext4_get_inline_size(dir) -
1673                                 EXT4_MIN_INLINE_DATA_SIZE;
1674         }
1675
1676         BUFFER_TRACE(bh, "get_write_access");
1677         err = ext4_journal_get_write_access(handle, bh);
1678         if (err)
1679                 goto out;
1680
1681         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1682                                         inline_start, inline_size, 0);
1683         if (err)
1684                 goto out;
1685
1686         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1687         err = ext4_mark_inode_dirty(handle, dir);
1688         if (unlikely(err))
1689                 goto out;
1690
1691         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1692 out:
1693         up_write(&EXT4_I(dir)->xattr_sem);
1694         brelse(iloc.bh);
1695         if (err != -ENOENT)
1696                 ext4_std_error(dir->i_sb, err);
1697         return err;
1698 }
1699
1700 /*
1701  * Get the inline dentry at offset.
1702  */
1703 static inline struct ext4_dir_entry_2 *
1704 ext4_get_inline_entry(struct inode *inode,
1705                       struct ext4_iloc *iloc,
1706                       unsigned int offset,
1707                       void **inline_start,
1708                       int *inline_size)
1709 {
1710         void *inline_pos;
1711
1712         BUG_ON(offset > ext4_get_inline_size(inode));
1713
1714         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1715                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1716                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1717         } else {
1718                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1719                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1720                 *inline_size = ext4_get_inline_size(inode) -
1721                                 EXT4_MIN_INLINE_DATA_SIZE;
1722         }
1723
1724         if (inline_start)
1725                 *inline_start = inline_pos;
1726         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1727 }
1728
1729 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1730 {
1731         int err, inline_size;
1732         struct ext4_iloc iloc;
1733         void *inline_pos;
1734         unsigned int offset;
1735         struct ext4_dir_entry_2 *de;
1736         int ret = 1;
1737
1738         err = ext4_get_inode_loc(dir, &iloc);
1739         if (err) {
1740                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1741                                  err, dir->i_ino);
1742                 return 1;
1743         }
1744
1745         down_read(&EXT4_I(dir)->xattr_sem);
1746         if (!ext4_has_inline_data(dir)) {
1747                 *has_inline_data = 0;
1748                 goto out;
1749         }
1750
1751         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1752         if (!le32_to_cpu(de->inode)) {
1753                 ext4_warning(dir->i_sb,
1754                              "bad inline directory (dir #%lu) - no `..'",
1755                              dir->i_ino);
1756                 ret = 1;
1757                 goto out;
1758         }
1759
1760         offset = EXT4_INLINE_DOTDOT_SIZE;
1761         while (offset < dir->i_size) {
1762                 de = ext4_get_inline_entry(dir, &iloc, offset,
1763                                            &inline_pos, &inline_size);
1764                 if (ext4_check_dir_entry(dir, NULL, de,
1765                                          iloc.bh, inline_pos,
1766                                          inline_size, offset)) {
1767                         ext4_warning(dir->i_sb,
1768                                      "bad inline directory (dir #%lu) - "
1769                                      "inode %u, rec_len %u, name_len %d"
1770                                      "inline size %d\n",
1771                                      dir->i_ino, le32_to_cpu(de->inode),
1772                                      le16_to_cpu(de->rec_len), de->name_len,
1773                                      inline_size);
1774                         ret = 1;
1775                         goto out;
1776                 }
1777                 if (le32_to_cpu(de->inode)) {
1778                         ret = 0;
1779                         goto out;
1780                 }
1781                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1782         }
1783
1784 out:
1785         up_read(&EXT4_I(dir)->xattr_sem);
1786         brelse(iloc.bh);
1787         return ret;
1788 }
1789
1790 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1791 {
1792         int ret;
1793
1794         down_write(&EXT4_I(inode)->xattr_sem);
1795         ret = ext4_destroy_inline_data_nolock(handle, inode);
1796         up_write(&EXT4_I(inode)->xattr_sem);
1797
1798         return ret;
1799 }
1800
1801 int ext4_inline_data_fiemap(struct inode *inode,
1802                             struct fiemap_extent_info *fieinfo,
1803                             int *has_inline)
1804 {
1805         __u64 physical = 0;
1806         __u64 length;
1807         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1808         int error = 0;
1809         struct ext4_iloc iloc;
1810
1811         down_read(&EXT4_I(inode)->xattr_sem);
1812         if (!ext4_has_inline_data(inode)) {
1813                 *has_inline = 0;
1814                 goto out;
1815         }
1816
1817         error = ext4_get_inode_loc(inode, &iloc);
1818         if (error)
1819                 goto out;
1820
1821         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1822         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1823         physical += offsetof(struct ext4_inode, i_block);
1824         length = i_size_read(inode);
1825
1826         if (physical)
1827                 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1828                                                 length, flags);
1829         brelse(iloc.bh);
1830 out:
1831         up_read(&EXT4_I(inode)->xattr_sem);
1832         return (error < 0 ? error : 0);
1833 }
1834
1835 /*
1836  * Called during xattr set, and if we can sparse space 'needed',
1837  * just create the extent tree evict the data to the outer block.
1838  *
1839  * We use jbd2 instead of page cache to move data to the 1st block
1840  * so that the whole transaction can be committed as a whole and
1841  * the data isn't lost because of the delayed page cache write.
1842  */
1843 int ext4_try_to_evict_inline_data(handle_t *handle,
1844                                   struct inode *inode,
1845                                   int needed)
1846 {
1847         int error;
1848         struct ext4_xattr_entry *entry;
1849         struct ext4_inode *raw_inode;
1850         struct ext4_iloc iloc;
1851
1852         error = ext4_get_inode_loc(inode, &iloc);
1853         if (error)
1854                 return error;
1855
1856         raw_inode = ext4_raw_inode(&iloc);
1857         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1858                                             EXT4_I(inode)->i_inline_off);
1859         if (EXT4_XATTR_LEN(entry->e_name_len) +
1860             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1861                 error = -ENOSPC;
1862                 goto out;
1863         }
1864
1865         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1866 out:
1867         brelse(iloc.bh);
1868         return error;
1869 }
1870
1871 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1872 {
1873         handle_t *handle;
1874         int inline_size, value_len, needed_blocks;
1875         size_t i_size;
1876         void *value = NULL;
1877         struct ext4_xattr_ibody_find is = {
1878                 .s = { .not_found = -ENODATA, },
1879         };
1880         struct ext4_xattr_info i = {
1881                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1882                 .name = EXT4_XATTR_SYSTEM_DATA,
1883         };
1884
1885
1886         needed_blocks = ext4_writepage_trans_blocks(inode);
1887         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1888         if (IS_ERR(handle))
1889                 return;
1890
1891         down_write(&EXT4_I(inode)->xattr_sem);
1892         if (!ext4_has_inline_data(inode)) {
1893                 *has_inline = 0;
1894                 ext4_journal_stop(handle);
1895                 return;
1896         }
1897
1898         if (ext4_orphan_add(handle, inode))
1899                 goto out;
1900
1901         if (ext4_get_inode_loc(inode, &is.iloc))
1902                 goto out;
1903
1904         down_write(&EXT4_I(inode)->i_data_sem);
1905         i_size = inode->i_size;
1906         inline_size = ext4_get_inline_size(inode);
1907         EXT4_I(inode)->i_disksize = i_size;
1908
1909         if (i_size < inline_size) {
1910                 /* Clear the content in the xattr space. */
1911                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1912                         if (ext4_xattr_ibody_find(inode, &i, &is))
1913                                 goto out_error;
1914
1915                         BUG_ON(is.s.not_found);
1916
1917                         value_len = le32_to_cpu(is.s.here->e_value_size);
1918                         value = kmalloc(value_len, GFP_NOFS);
1919                         if (!value)
1920                                 goto out_error;
1921
1922                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1923                                                 value, value_len))
1924                                 goto out_error;
1925
1926                         i.value = value;
1927                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1928                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1929                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1930                                 goto out_error;
1931                 }
1932
1933                 /* Clear the content within i_blocks. */
1934                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1935                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1936                         memset(p + i_size, 0,
1937                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1938                 }
1939
1940                 EXT4_I(inode)->i_inline_size = i_size <
1941                                         EXT4_MIN_INLINE_DATA_SIZE ?
1942                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1943         }
1944
1945 out_error:
1946         up_write(&EXT4_I(inode)->i_data_sem);
1947 out:
1948         brelse(is.iloc.bh);
1949         up_write(&EXT4_I(inode)->xattr_sem);
1950         kfree(value);
1951         if (inode->i_nlink)
1952                 ext4_orphan_del(handle, inode);
1953
1954         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1955         ext4_mark_inode_dirty(handle, inode);
1956         if (IS_SYNC(inode))
1957                 ext4_handle_sync(handle);
1958
1959         ext4_journal_stop(handle);
1960         return;
1961 }
1962
1963 int ext4_convert_inline_data(struct inode *inode)
1964 {
1965         int error, needed_blocks;
1966         handle_t *handle;
1967         struct ext4_iloc iloc;
1968
1969         if (!ext4_has_inline_data(inode)) {
1970                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1971                 return 0;
1972         }
1973
1974         needed_blocks = ext4_writepage_trans_blocks(inode);
1975
1976         iloc.bh = NULL;
1977         error = ext4_get_inode_loc(inode, &iloc);
1978         if (error)
1979                 return error;
1980
1981         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1982         if (IS_ERR(handle)) {
1983                 error = PTR_ERR(handle);
1984                 goto out_free;
1985         }
1986
1987         down_write(&EXT4_I(inode)->xattr_sem);
1988         if (!ext4_has_inline_data(inode)) {
1989                 up_write(&EXT4_I(inode)->xattr_sem);
1990                 goto out;
1991         }
1992
1993         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1994         up_write(&EXT4_I(inode)->xattr_sem);
1995 out:
1996         ext4_journal_stop(handle);
1997 out_free:
1998         brelse(iloc.bh);
1999         return error;
2000 }