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 /*
 124  * this function does not take xattr_sem, which is OK because it is
 125  * currently only used in a code path coming form ext4_iget, before
 126  * the new inode has been unlocked
 127  */
 128 int ext4_find_inline_data_nolock(struct inode *inode)
 129 {
 130         struct ext4_xattr_ibody_find is = {
 131                 .s = { .not_found = -ENODATA, },
 132         };
 133         struct ext4_xattr_info i = {
 134                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 135                 .name = EXT4_XATTR_SYSTEM_DATA,
 136         };
 137         int error;
 138
 139         if (EXT4_I(inode)->i_extra_isize == 0)
 140                 return 0;
 141
 142         error = ext4_get_inode_loc(inode, &is.iloc);
 143         if (error)
 144                 return error;
 145
 146         error = ext4_xattr_ibody_find(inode, &i, &is);
 147         if (error)
 148                 goto out;
 149
 150         if (!is.s.not_found) {
 151                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 152                                         (void *)ext4_raw_inode(&is.iloc));
 153                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 154                                 le32_to_cpu(is.s.here->e_value_size);
 155                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 156         }
 157 out:
 158         brelse(is.iloc.bh);
 159         return error;
 160 }
 161
 162 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 163                                  unsigned int len,
 164                                  struct ext4_iloc *iloc)
 165 {
 166         struct ext4_xattr_entry *entry;
 167         struct ext4_xattr_ibody_header *header;
 168         int cp_len = 0;
 169         struct ext4_inode *raw_inode;
 170
 171         if (!len)
 172                 return 0;
 173
 174         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 175
 176         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 177                         len : EXT4_MIN_INLINE_DATA_SIZE;
 178
 179         raw_inode = ext4_raw_inode(iloc);
 180         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 181
 182         len -= cp_len;
 183         buffer += cp_len;
 184
 185         if (!len)
 186                 goto out;
 187
 188         header = IHDR(inode, raw_inode);
 189         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 190                                             EXT4_I(inode)->i_inline_off);
 191         len = min_t(unsigned int, len,
 192                     (unsigned int)le32_to_cpu(entry->e_value_size));
 193
 194         memcpy(buffer,
 195                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 196         cp_len += len;
 197
 198 out:
 199         return cp_len;
 200 }
 201
 202 /*
 203  * write the buffer to the inline inode.
 204  * If 'create' is set, we don't need to do the extra copy in the xattr
 205  * value since it is already handled by ext4_xattr_ibody_inline_set.
 206  * That saves us one memcpy.
 207  */
 208 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 209                                    void *buffer, loff_t pos, unsigned int len)
 210 {
 211         struct ext4_xattr_entry *entry;
 212         struct ext4_xattr_ibody_header *header;
 213         struct ext4_inode *raw_inode;
 214         int cp_len = 0;
 215
 216         BUG_ON(!EXT4_I(inode)->i_inline_off);
 217         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 218
 219         raw_inode = ext4_raw_inode(iloc);
 220         buffer += pos;
 221
 222         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 223                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 224                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 225                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 226
 227                 len -= cp_len;
 228                 buffer += cp_len;
 229                 pos += cp_len;
 230         }
 231
 232         if (!len)
 233                 return;
 234
 235         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 236         header = IHDR(inode, raw_inode);
 237         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 238                                             EXT4_I(inode)->i_inline_off);
 239
 240         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 241                buffer, len);
 242 }
 243
 244 static int ext4_create_inline_data(handle_t *handle,
 245                                    struct inode *inode, unsigned len)
 246 {
 247         int error;
 248         void *value = NULL;
 249         struct ext4_xattr_ibody_find is = {
 250                 .s = { .not_found = -ENODATA, },
 251         };
 252         struct ext4_xattr_info i = {
 253                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 254                 .name = EXT4_XATTR_SYSTEM_DATA,
 255         };
 256
 257         error = ext4_get_inode_loc(inode, &is.iloc);
 258         if (error)
 259                 return error;
 260
 261         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 262         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 263         if (error)
 264                 goto out;
 265
 266         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 267                 value = EXT4_ZERO_XATTR_VALUE;
 268                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 269         } else {
 270                 value = "";
 271                 len = 0;
 272         }
 273
 274         /* Insert the the xttr entry. */
 275         i.value = value;
 276         i.value_len = len;
 277
 278         error = ext4_xattr_ibody_find(inode, &i, &is);
 279         if (error)
 280                 goto out;
 281
 282         BUG_ON(!is.s.not_found);
 283
 284         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 285         if (error) {
 286                 if (error == -ENOSPC)
 287                         ext4_clear_inode_state(inode,
 288                                                EXT4_STATE_MAY_INLINE_DATA);
 289                 goto out;
 290         }
 291
 292         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 293                 0, EXT4_MIN_INLINE_DATA_SIZE);
 294
 295         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 296                                       (void *)ext4_raw_inode(&is.iloc));
 297         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 298         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 299         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 300         get_bh(is.iloc.bh);
 301         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 302
 303 out:
 304         brelse(is.iloc.bh);
 305         return error;
 306 }
 307
 308 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 309                                    unsigned int len)
 310 {
 311         int error;
 312         void *value = NULL;
 313         struct ext4_xattr_ibody_find is = {
 314                 .s = { .not_found = -ENODATA, },
 315         };
 316         struct ext4_xattr_info i = {
 317                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 318                 .name = EXT4_XATTR_SYSTEM_DATA,
 319         };
 320
 321         /* If the old space is ok, write the data directly. */
 322         if (len <= EXT4_I(inode)->i_inline_size)
 323                 return 0;
 324
 325         error = ext4_get_inode_loc(inode, &is.iloc);
 326         if (error)
 327                 return error;
 328
 329         error = ext4_xattr_ibody_find(inode, &i, &is);
 330         if (error)
 331                 goto out;
 332
 333         BUG_ON(is.s.not_found);
 334
 335         len -= EXT4_MIN_INLINE_DATA_SIZE;
 336         value = kzalloc(len, GFP_NOFS);
 337         if (!value)
 338                 goto out;
 339
 340         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 341                                      value, len);
 342         if (error == -ENODATA)
 343                 goto out;
 344
 345         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 346         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 347         if (error)
 348                 goto out;
 349
 350         /* Update the xttr entry. */
 351         i.value = value;
 352         i.value_len = len;
 353
 354         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 355         if (error)
 356                 goto out;
 357
 358         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 359                                       (void *)ext4_raw_inode(&is.iloc));
 360         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 361                                 le32_to_cpu(is.s.here->e_value_size);
 362         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 363         get_bh(is.iloc.bh);
 364         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 365
 366 out:
 367         kfree(value);
 368         brelse(is.iloc.bh);
 369         return error;
 370 }
 371
 372 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 373                                     unsigned int len)
 374 {
 375         int ret, size;
 376         struct ext4_inode_info *ei = EXT4_I(inode);
 377
 378         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 379                 return -ENOSPC;
 380
 381         size = ext4_get_max_inline_size(inode);
 382         if (size < len)
 383                 return -ENOSPC;
 384
 385         down_write(&EXT4_I(inode)->xattr_sem);
 386
 387         if (ei->i_inline_off)
 388                 ret = ext4_update_inline_data(handle, inode, len);
 389         else
 390                 ret = ext4_create_inline_data(handle, inode, len);
 391
 392         up_write(&EXT4_I(inode)->xattr_sem);
 393
 394         return ret;
 395 }
 396
 397 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 398                                            struct inode *inode)
 399 {
 400         struct ext4_inode_info *ei = EXT4_I(inode);
 401         struct ext4_xattr_ibody_find is = {
 402                 .s = { .not_found = 0, },
 403         };
 404         struct ext4_xattr_info i = {
 405                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 406                 .name = EXT4_XATTR_SYSTEM_DATA,
 407                 .value = NULL,
 408                 .value_len = 0,
 409         };
 410         int error;
 411
 412         if (!ei->i_inline_off)
 413                 return 0;
 414
 415         error = ext4_get_inode_loc(inode, &is.iloc);
 416         if (error)
 417                 return error;
 418
 419         error = ext4_xattr_ibody_find(inode, &i, &is);
 420         if (error)
 421                 goto out;
 422
 423         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 424         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 425         if (error)
 426                 goto out;
 427
 428         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 429         if (error)
 430                 goto out;
 431
 432         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 433                 0, EXT4_MIN_INLINE_DATA_SIZE);
 434
 435         if (EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
 436                                       EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 437                 if (S_ISDIR(inode->i_mode) ||
 438                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 439                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 440                         ext4_ext_tree_init(handle, inode);
 441                 }
 442         }
 443         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 444
 445         get_bh(is.iloc.bh);
 446         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 447
 448         EXT4_I(inode)->i_inline_off = 0;
 449         EXT4_I(inode)->i_inline_size = 0;
 450         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 451 out:
 452         brelse(is.iloc.bh);
 453         if (error == -ENODATA)
 454                 error = 0;
 455         return error;
 456 }
 457
 458 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 459 {
 460         void *kaddr;
 461         int ret = 0;
 462         size_t len;
 463         struct ext4_iloc iloc;
 464
 465         BUG_ON(!PageLocked(page));
 466         BUG_ON(!ext4_has_inline_data(inode));
 467         BUG_ON(page->index);
 468
 469         if (!EXT4_I(inode)->i_inline_off) {
 470                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 471                              inode->i_ino);
 472                 goto out;
 473         }
 474
 475         ret = ext4_get_inode_loc(inode, &iloc);
 476         if (ret)
 477                 goto out;
 478
 479         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 480         kaddr = kmap_atomic(page);
 481         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 482         flush_dcache_page(page);
 483         kunmap_atomic(kaddr);
 484         zero_user_segment(page, len, PAGE_CACHE_SIZE);
 485         SetPageUptodate(page);
 486         brelse(iloc.bh);
 487
 488 out:
 489         return ret;
 490 }
 491
 492 int ext4_readpage_inline(struct inode *inode, struct page *page)
 493 {
 494         int ret = 0;
 495
 496         down_read(&EXT4_I(inode)->xattr_sem);
 497         if (!ext4_has_inline_data(inode)) {
 498                 up_read(&EXT4_I(inode)->xattr_sem);
 499                 return -EAGAIN;
 500         }
 501
 502         /*
 503          * Current inline data can only exist in the 1st page,
 504          * So for all the other pages, just set them uptodate.
 505          */
 506         if (!page->index)
 507                 ret = ext4_read_inline_page(inode, page);
 508         else if (!PageUptodate(page)) {
 509                 zero_user_segment(page, 0, PAGE_CACHE_SIZE);
 510                 SetPageUptodate(page);
 511         }
 512
 513         up_read(&EXT4_I(inode)->xattr_sem);
 514
 515         unlock_page(page);
 516         return ret >= 0 ? 0 : ret;
 517 }
 518
 519 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 520                                               struct inode *inode,
 521                                               unsigned flags)
 522 {
 523         int ret, needed_blocks;
 524         handle_t *handle = NULL;
 525         int retries = 0, sem_held = 0;
 526         struct page *page = NULL;
 527         unsigned from, to;
 528         struct ext4_iloc iloc;
 529
 530         if (!ext4_has_inline_data(inode)) {
 531                 /*
 532                  * clear the flag so that no new write
 533                  * will trap here again.
 534                  */
 535                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 536                 return 0;
 537         }
 538
 539         needed_blocks = ext4_writepage_trans_blocks(inode);
 540
 541         ret = ext4_get_inode_loc(inode, &iloc);
 542         if (ret)
 543                 return ret;
 544
 545 retry:
 546         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 547         if (IS_ERR(handle)) {
 548                 ret = PTR_ERR(handle);
 549                 handle = NULL;
 550                 goto out;
 551         }
 552
 553         /* We cannot recurse into the filesystem as the transaction is already
 554          * started */
 555         flags |= AOP_FLAG_NOFS;
 556
 557         page = grab_cache_page_write_begin(mapping, 0, flags);
 558         if (!page) {
 559                 ret = -ENOMEM;
 560                 goto out;
 561         }
 562
 563         down_write(&EXT4_I(inode)->xattr_sem);
 564         sem_held = 1;
 565         /* If some one has already done this for us, just exit. */
 566         if (!ext4_has_inline_data(inode)) {
 567                 ret = 0;
 568                 goto out;
 569         }
 570
 571         from = 0;
 572         to = ext4_get_inline_size(inode);
 573         if (!PageUptodate(page)) {
 574                 ret = ext4_read_inline_page(inode, page);
 575                 if (ret < 0)
 576                         goto out;
 577         }
 578
 579         ret = ext4_destroy_inline_data_nolock(handle, inode);
 580         if (ret)
 581                 goto out;
 582
 583         if (ext4_should_dioread_nolock(inode))
 584                 ret = __block_write_begin(page, from, to, ext4_get_block_write);
 585         else
 586                 ret = __block_write_begin(page, from, to, ext4_get_block);
 587
 588         if (!ret && ext4_should_journal_data(inode)) {
 589                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 590                                              from, to, NULL,
 591                                              do_journal_get_write_access);
 592         }
 593
 594         if (ret) {
 595                 unlock_page(page);
 596                 page_cache_release(page);
 597                 page = NULL;
 598                 ext4_orphan_add(handle, inode);
 599                 up_write(&EXT4_I(inode)->xattr_sem);
 600                 sem_held = 0;
 601                 ext4_journal_stop(handle);
 602                 handle = NULL;
 603                 ext4_truncate_failed_write(inode);
 604                 /*
 605                  * If truncate failed early the inode might
 606                  * still be on the orphan list; we need to
 607                  * make sure the inode is removed from the
 608                  * orphan list in that case.
 609                  */
 610                 if (inode->i_nlink)
 611                         ext4_orphan_del(NULL, inode);
 612         }
 613
 614         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 615                 goto retry;
 616
 617         if (page)
 618                 block_commit_write(page, from, to);
 619 out:
 620         if (page) {
 621                 unlock_page(page);
 622                 page_cache_release(page);
 623         }
 624         if (sem_held)
 625                 up_write(&EXT4_I(inode)->xattr_sem);
 626         if (handle)
 627                 ext4_journal_stop(handle);
 628         brelse(iloc.bh);
 629         return ret;
 630 }
 631
 632 /*
 633  * Try to write data in the inode.
 634  * If the inode has inline data, check whether the new write can be
 635  * in the inode also. If not, create the page the handle, move the data
 636  * to the page make it update and let the later codes create extent for it.
 637  */
 638 int ext4_try_to_write_inline_data(struct address_space *mapping,
 639                                   struct inode *inode,
 640                                   loff_t pos, unsigned len,
 641                                   unsigned flags,
 642                                   struct page **pagep)
 643 {
 644         int ret;
 645         handle_t *handle;
 646         struct page *page;
 647         struct ext4_iloc iloc;
 648
 649         if (pos + len > ext4_get_max_inline_size(inode))
 650                 goto convert;
 651
 652         ret = ext4_get_inode_loc(inode, &iloc);
 653         if (ret)
 654                 return ret;
 655
 656         /*
 657          * The possible write could happen in the inode,
 658          * so try to reserve the space in inode first.
 659          */
 660         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 661         if (IS_ERR(handle)) {
 662                 ret = PTR_ERR(handle);
 663                 handle = NULL;
 664                 goto out;
 665         }
 666
 667         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 668         if (ret && ret != -ENOSPC)
 669                 goto out;
 670
 671         /* We don't have space in inline inode, so convert it to extent. */
 672         if (ret == -ENOSPC) {
 673                 ext4_journal_stop(handle);
 674                 brelse(iloc.bh);
 675                 goto convert;
 676         }
 677
 678         flags |= AOP_FLAG_NOFS;
 679
 680         page = grab_cache_page_write_begin(mapping, 0, flags);
 681         if (!page) {
 682                 ret = -ENOMEM;
 683                 goto out;
 684         }
 685
 686         *pagep = page;
 687         down_read(&EXT4_I(inode)->xattr_sem);
 688         if (!ext4_has_inline_data(inode)) {
 689                 ret = 0;
 690                 unlock_page(page);
 691                 page_cache_release(page);
 692                 goto out_up_read;
 693         }
 694
 695         if (!PageUptodate(page)) {
 696                 ret = ext4_read_inline_page(inode, page);
 697                 if (ret < 0)
 698                         goto out_up_read;
 699         }
 700
 701         ret = 1;
 702         handle = NULL;
 703 out_up_read:
 704         up_read(&EXT4_I(inode)->xattr_sem);
 705 out:
 706         if (handle)
 707                 ext4_journal_stop(handle);
 708         brelse(iloc.bh);
 709         return ret;
 710 convert:
 711         return ext4_convert_inline_data_to_extent(mapping,
 712                                                   inode, flags);
 713 }
 714
 715 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 716                                unsigned copied, struct page *page)
 717 {
 718         int ret;
 719         void *kaddr;
 720         struct ext4_iloc iloc;
 721
 722         if (unlikely(copied < len)) {
 723                 if (!PageUptodate(page)) {
 724                         copied = 0;
 725                         goto out;
 726                 }
 727         }
 728
 729         ret = ext4_get_inode_loc(inode, &iloc);
 730         if (ret) {
 731                 ext4_std_error(inode->i_sb, ret);
 732                 copied = 0;
 733                 goto out;
 734         }
 735
 736         down_write(&EXT4_I(inode)->xattr_sem);
 737         BUG_ON(!ext4_has_inline_data(inode));
 738
 739         kaddr = kmap_atomic(page);
 740         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 741         kunmap_atomic(kaddr);
 742         SetPageUptodate(page);
 743         /* clear page dirty so that writepages wouldn't work for us. */
 744         ClearPageDirty(page);
 745
 746         up_write(&EXT4_I(inode)->xattr_sem);
 747         brelse(iloc.bh);
 748 out:
 749         return copied;
 750 }
 751
 752 struct buffer_head *
 753 ext4_journalled_write_inline_data(struct inode *inode,
 754                                   unsigned len,
 755                                   struct page *page)
 756 {
 757         int ret;
 758         void *kaddr;
 759         struct ext4_iloc iloc;
 760
 761         ret = ext4_get_inode_loc(inode, &iloc);
 762         if (ret) {
 763                 ext4_std_error(inode->i_sb, ret);
 764                 return NULL;
 765         }
 766
 767         down_write(&EXT4_I(inode)->xattr_sem);
 768         kaddr = kmap_atomic(page);
 769         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 770         kunmap_atomic(kaddr);
 771         up_write(&EXT4_I(inode)->xattr_sem);
 772
 773         return iloc.bh;
 774 }
 775
 776 /*
 777  * Try to make the page cache and handle ready for the inline data case.
 778  * We can call this function in 2 cases:
 779  * 1. The inode is created and the first write exceeds inline size. We can
 780  *    clear the inode state safely.
 781  * 2. The inode has inline data, then we need to read the data, make it
 782  *    update and dirty so that ext4_da_writepages can handle it. We don't
 783  *    need to start the journal since the file's metatdata isn't changed now.
 784  */
 785 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 786                                                  struct inode *inode,
 787                                                  unsigned flags,
 788                                                  void **fsdata)
 789 {
 790         int ret = 0, inline_size;
 791         struct page *page;
 792
 793         page = grab_cache_page_write_begin(mapping, 0, flags);
 794         if (!page)
 795                 return -ENOMEM;
 796
 797         down_read(&EXT4_I(inode)->xattr_sem);
 798         if (!ext4_has_inline_data(inode)) {
 799                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 800                 goto out;
 801         }
 802
 803         inline_size = ext4_get_inline_size(inode);
 804
 805         if (!PageUptodate(page)) {
 806                 ret = ext4_read_inline_page(inode, page);
 807                 if (ret < 0)
 808                         goto out;
 809         }
 810
 811         ret = __block_write_begin(page, 0, inline_size,
 812                                   ext4_da_get_block_prep);
 813         if (ret) {
 814                 up_read(&EXT4_I(inode)->xattr_sem);
 815                 unlock_page(page);
 816                 page_cache_release(page);
 817                 ext4_truncate_failed_write(inode);
 818                 return ret;
 819         }
 820
 821         SetPageDirty(page);
 822         SetPageUptodate(page);
 823         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 824         *fsdata = (void *)CONVERT_INLINE_DATA;
 825
 826 out:
 827         up_read(&EXT4_I(inode)->xattr_sem);
 828         if (page) {
 829                 unlock_page(page);
 830                 page_cache_release(page);
 831         }
 832         return ret;
 833 }
 834
 835 /*
 836  * Prepare the write for the inline data.
 837  * If the the data can be written into the inode, we just read
 838  * the page and make it uptodate, and start the journal.
 839  * Otherwise read the page, makes it dirty so that it can be
 840  * handle in writepages(the i_disksize update is left to the
 841  * normal ext4_da_write_end).
 842  */
 843 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 844                                     struct inode *inode,
 845                                     loff_t pos, unsigned len,
 846                                     unsigned flags,
 847                                     struct page **pagep,
 848                                     void **fsdata)
 849 {
 850         int ret, inline_size;
 851         handle_t *handle;
 852         struct page *page;
 853         struct ext4_iloc iloc;
 854         int retries;
 855
 856         ret = ext4_get_inode_loc(inode, &iloc);
 857         if (ret)
 858                 return ret;
 859
 860 retry_journal:
 861         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 862         if (IS_ERR(handle)) {
 863                 ret = PTR_ERR(handle);
 864                 goto out;
 865         }
 866
 867         inline_size = ext4_get_max_inline_size(inode);
 868
 869         ret = -ENOSPC;
 870         if (inline_size >= pos + len) {
 871                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 872                 if (ret && ret != -ENOSPC)
 873                         goto out_journal;
 874         }
 875
 876         /*
 877          * We cannot recurse into the filesystem as the transaction
 878          * is already started.
 879          */
 880         flags |= AOP_FLAG_NOFS;
 881
 882         if (ret == -ENOSPC) {
 883                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 884                                                             inode,
 885                                                             flags,
 886                                                             fsdata);
 887                 ext4_journal_stop(handle);
 888                 if (ret == -ENOSPC &&
 889                     ext4_should_retry_alloc(inode->i_sb, &retries))
 890                         goto retry_journal;
 891                 goto out;
 892         }
 893
 894
 895         page = grab_cache_page_write_begin(mapping, 0, flags);
 896         if (!page) {
 897                 ret = -ENOMEM;
 898                 goto out_journal;
 899         }
 900
 901         down_read(&EXT4_I(inode)->xattr_sem);
 902         if (!ext4_has_inline_data(inode)) {
 903                 ret = 0;
 904                 goto out_release_page;
 905         }
 906
 907         if (!PageUptodate(page)) {
 908                 ret = ext4_read_inline_page(inode, page);
 909                 if (ret < 0)
 910                         goto out_release_page;
 911         }
 912
 913         up_read(&EXT4_I(inode)->xattr_sem);
 914         *pagep = page;
 915         brelse(iloc.bh);
 916         return 1;
 917 out_release_page:
 918         up_read(&EXT4_I(inode)->xattr_sem);
 919         unlock_page(page);
 920         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_metadata_csum(inode->i_sb))
1136                 csum_size = sizeof(struct ext4_dir_entry_tail);
1137
1138         inode->i_size = inode->i_sb->s_blocksize;
1139         i_size_write(inode, inode->i_sb->s_blocksize);
1140         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1141         ext4_update_final_de(dir_block->b_data,
1142                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1143                         inode->i_sb->s_blocksize - csum_size);
1144
1145         if (csum_size) {
1146                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1147                                      inode->i_sb->s_blocksize);
1148                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1149         }
1150         set_buffer_uptodate(dir_block);
1151         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1152         if (err)
1153                 goto out;
1154         set_buffer_verified(dir_block);
1155 out:
1156         return err;
1157 }
1158
1159 static int ext4_convert_inline_data_nolock(handle_t *handle,
1160                                            struct inode *inode,
1161                                            struct ext4_iloc *iloc)
1162 {
1163         int error;
1164         void *buf = NULL;
1165         struct buffer_head *data_bh = NULL;
1166         struct ext4_map_blocks map;
1167         int inline_size;
1168
1169         inline_size = ext4_get_inline_size(inode);
1170         buf = kmalloc(inline_size, GFP_NOFS);
1171         if (!buf) {
1172                 error = -ENOMEM;
1173                 goto out;
1174         }
1175
1176         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1177         if (error < 0)
1178                 goto out;
1179
1180         /*
1181          * Make sure the inline directory entries pass checks before we try to
1182          * convert them, so that we avoid touching stuff that needs fsck.
1183          */
1184         if (S_ISDIR(inode->i_mode)) {
1185                 error = ext4_check_all_de(inode, iloc->bh,
1186                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1187                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1188                 if (error)
1189                         goto out;
1190         }
1191
1192         error = ext4_destroy_inline_data_nolock(handle, inode);
1193         if (error)
1194                 goto out;
1195
1196         map.m_lblk = 0;
1197         map.m_len = 1;
1198         map.m_flags = 0;
1199         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1200         if (error < 0)
1201                 goto out_restore;
1202         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1203                 error = -EIO;
1204                 goto out_restore;
1205         }
1206
1207         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1208         if (!data_bh) {
1209                 error = -ENOMEM;
1210                 goto out_restore;
1211         }
1212
1213         lock_buffer(data_bh);
1214         error = ext4_journal_get_create_access(handle, data_bh);
1215         if (error) {
1216                 unlock_buffer(data_bh);
1217                 error = -EIO;
1218                 goto out_restore;
1219         }
1220         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1221
1222         if (!S_ISDIR(inode->i_mode)) {
1223                 memcpy(data_bh->b_data, buf, inline_size);
1224                 set_buffer_uptodate(data_bh);
1225                 error = ext4_handle_dirty_metadata(handle,
1226                                                    inode, data_bh);
1227         } else {
1228                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1229                                                        buf, inline_size);
1230         }
1231
1232         unlock_buffer(data_bh);
1233 out_restore:
1234         if (error)
1235                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1236
1237 out:
1238         brelse(data_bh);
1239         kfree(buf);
1240         return error;
1241 }
1242
1243 /*
1244  * Try to add the new entry to the inline data.
1245  * If succeeds, return 0. If not, extended the inline dir and copied data to
1246  * the new created block.
1247  */
1248 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1249                               struct inode *inode)
1250 {
1251         int ret, inline_size;
1252         void *inline_start;
1253         struct ext4_iloc iloc;
1254         struct inode *dir = dentry->d_parent->d_inode;
1255
1256         ret = ext4_get_inode_loc(dir, &iloc);
1257         if (ret)
1258                 return ret;
1259
1260         down_write(&EXT4_I(dir)->xattr_sem);
1261         if (!ext4_has_inline_data(dir))
1262                 goto out;
1263
1264         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1265                                                  EXT4_INLINE_DOTDOT_SIZE;
1266         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1267
1268         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1269                                         inline_start, inline_size);
1270         if (ret != -ENOSPC)
1271                 goto out;
1272
1273         /* check whether it can be inserted to inline xattr space. */
1274         inline_size = EXT4_I(dir)->i_inline_size -
1275                         EXT4_MIN_INLINE_DATA_SIZE;
1276         if (!inline_size) {
1277                 /* Try to use the xattr space.*/
1278                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1279                 if (ret && ret != -ENOSPC)
1280                         goto out;
1281
1282                 inline_size = EXT4_I(dir)->i_inline_size -
1283                                 EXT4_MIN_INLINE_DATA_SIZE;
1284         }
1285
1286         if (inline_size) {
1287                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1288
1289                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1290                                                 inline_start, inline_size);
1291
1292                 if (ret != -ENOSPC)
1293                         goto out;
1294         }
1295
1296         /*
1297          * The inline space is filled up, so create a new block for it.
1298          * As the extent tree will be created, we have to save the inline
1299          * dir first.
1300          */
1301         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1302
1303 out:
1304         ext4_mark_inode_dirty(handle, dir);
1305         up_write(&EXT4_I(dir)->xattr_sem);
1306         brelse(iloc.bh);
1307         return ret;
1308 }
1309
1310 /*
1311  * This function fills a red-black tree with information from an
1312  * inlined dir.  It returns the number directory entries loaded
1313  * into the tree.  If there is an error it is returned in err.
1314  */
1315 int htree_inlinedir_to_tree(struct file *dir_file,
1316                             struct inode *dir, ext4_lblk_t block,
1317                             struct dx_hash_info *hinfo,
1318                             __u32 start_hash, __u32 start_minor_hash,
1319                             int *has_inline_data)
1320 {
1321         int err = 0, count = 0;
1322         unsigned int parent_ino;
1323         int pos;
1324         struct ext4_dir_entry_2 *de;
1325         struct inode *inode = file_inode(dir_file);
1326         int ret, inline_size = 0;
1327         struct ext4_iloc iloc;
1328         void *dir_buf = NULL;
1329         struct ext4_dir_entry_2 fake;
1330
1331         ret = ext4_get_inode_loc(inode, &iloc);
1332         if (ret)
1333                 return ret;
1334
1335         down_read(&EXT4_I(inode)->xattr_sem);
1336         if (!ext4_has_inline_data(inode)) {
1337                 up_read(&EXT4_I(inode)->xattr_sem);
1338                 *has_inline_data = 0;
1339                 goto out;
1340         }
1341
1342         inline_size = ext4_get_inline_size(inode);
1343         dir_buf = kmalloc(inline_size, GFP_NOFS);
1344         if (!dir_buf) {
1345                 ret = -ENOMEM;
1346                 up_read(&EXT4_I(inode)->xattr_sem);
1347                 goto out;
1348         }
1349
1350         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1351         up_read(&EXT4_I(inode)->xattr_sem);
1352         if (ret < 0)
1353                 goto out;
1354
1355         pos = 0;
1356         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1357         while (pos < inline_size) {
1358                 /*
1359                  * As inlined dir doesn't store any information about '.' and
1360                  * only the inode number of '..' is stored, we have to handle
1361                  * them differently.
1362                  */
1363                 if (pos == 0) {
1364                         fake.inode = cpu_to_le32(inode->i_ino);
1365                         fake.name_len = 1;
1366                         strcpy(fake.name, ".");
1367                         fake.rec_len = ext4_rec_len_to_disk(
1368                                                 EXT4_DIR_REC_LEN(fake.name_len),
1369                                                 inline_size);
1370                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1371                         de = &fake;
1372                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1373                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1374                         fake.inode = cpu_to_le32(parent_ino);
1375                         fake.name_len = 2;
1376                         strcpy(fake.name, "..");
1377                         fake.rec_len = ext4_rec_len_to_disk(
1378                                                 EXT4_DIR_REC_LEN(fake.name_len),
1379                                                 inline_size);
1380                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1381                         de = &fake;
1382                         pos = EXT4_INLINE_DOTDOT_SIZE;
1383                 } else {
1384                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1385                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1386                         if (ext4_check_dir_entry(inode, dir_file, de,
1387                                          iloc.bh, dir_buf,
1388                                          inline_size, pos)) {
1389                                 ret = count;
1390                                 goto out;
1391                         }
1392                 }
1393
1394                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1395                 if ((hinfo->hash < start_hash) ||
1396                     ((hinfo->hash == start_hash) &&
1397                      (hinfo->minor_hash < start_minor_hash)))
1398                         continue;
1399                 if (de->inode == 0)
1400                         continue;
1401                 err = ext4_htree_store_dirent(dir_file,
1402                                    hinfo->hash, hinfo->minor_hash, de);
1403                 if (err) {
1404                         count = err;
1405                         goto out;
1406                 }
1407                 count++;
1408         }
1409         ret = count;
1410 out:
1411         kfree(dir_buf);
1412         brelse(iloc.bh);
1413         return ret;
1414 }
1415
1416 /*
1417  * So this function is called when the volume is mkfsed with
1418  * dir_index disabled. In order to keep f_pos persistent
1419  * after we convert from an inlined dir to a blocked based,
1420  * we just pretend that we are a normal dir and return the
1421  * offset as if '.' and '..' really take place.
1422  *
1423  */
1424 int ext4_read_inline_dir(struct file *file,
1425                          struct dir_context *ctx,
1426                          int *has_inline_data)
1427 {
1428         unsigned int offset, parent_ino;
1429         int i;
1430         struct ext4_dir_entry_2 *de;
1431         struct super_block *sb;
1432         struct inode *inode = file_inode(file);
1433         int ret, inline_size = 0;
1434         struct ext4_iloc iloc;
1435         void *dir_buf = NULL;
1436         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1437
1438         ret = ext4_get_inode_loc(inode, &iloc);
1439         if (ret)
1440                 return ret;
1441
1442         down_read(&EXT4_I(inode)->xattr_sem);
1443         if (!ext4_has_inline_data(inode)) {
1444                 up_read(&EXT4_I(inode)->xattr_sem);
1445                 *has_inline_data = 0;
1446                 goto out;
1447         }
1448
1449         inline_size = ext4_get_inline_size(inode);
1450         dir_buf = kmalloc(inline_size, GFP_NOFS);
1451         if (!dir_buf) {
1452                 ret = -ENOMEM;
1453                 up_read(&EXT4_I(inode)->xattr_sem);
1454                 goto out;
1455         }
1456
1457         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1458         up_read(&EXT4_I(inode)->xattr_sem);
1459         if (ret < 0)
1460                 goto out;
1461
1462         ret = 0;
1463         sb = inode->i_sb;
1464         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1465         offset = ctx->pos;
1466
1467         /*
1468          * dotdot_offset and dotdot_size is the real offset and
1469          * size for ".." and "." if the dir is block based while
1470          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1471          * So we will use extra_offset and extra_size to indicate them
1472          * during the inline dir iteration.
1473          */
1474         dotdot_offset = EXT4_DIR_REC_LEN(1);
1475         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1476         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1477         extra_size = extra_offset + inline_size;
1478
1479         /*
1480          * If the version has changed since the last call to
1481          * readdir(2), then we might be pointing to an invalid
1482          * dirent right now.  Scan from the start of the inline
1483          * dir to make sure.
1484          */
1485         if (file->f_version != inode->i_version) {
1486                 for (i = 0; i < extra_size && i < offset;) {
1487                         /*
1488                          * "." is with offset 0 and
1489                          * ".." is dotdot_offset.
1490                          */
1491                         if (!i) {
1492                                 i = dotdot_offset;
1493                                 continue;
1494                         } else if (i == dotdot_offset) {
1495                                 i = dotdot_size;
1496                                 continue;
1497                         }
1498                         /* for other entry, the real offset in
1499                          * the buf has to be tuned accordingly.
1500                          */
1501                         de = (struct ext4_dir_entry_2 *)
1502                                 (dir_buf + i - extra_offset);
1503                         /* It's too expensive to do a full
1504                          * dirent test each time round this
1505                          * loop, but we do have to test at
1506                          * least that it is non-zero.  A
1507                          * failure will be detected in the
1508                          * dirent test below. */
1509                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1510                                 < EXT4_DIR_REC_LEN(1))
1511                                 break;
1512                         i += ext4_rec_len_from_disk(de->rec_len,
1513                                                     extra_size);
1514                 }
1515                 offset = i;
1516                 ctx->pos = offset;
1517                 file->f_version = inode->i_version;
1518         }
1519
1520         while (ctx->pos < extra_size) {
1521                 if (ctx->pos == 0) {
1522                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1523                                 goto out;
1524                         ctx->pos = dotdot_offset;
1525                         continue;
1526                 }
1527
1528                 if (ctx->pos == dotdot_offset) {
1529                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1530                                 goto out;
1531                         ctx->pos = dotdot_size;
1532                         continue;
1533                 }
1534
1535                 de = (struct ext4_dir_entry_2 *)
1536                         (dir_buf + ctx->pos - extra_offset);
1537                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1538                                          extra_size, ctx->pos))
1539                         goto out;
1540                 if (le32_to_cpu(de->inode)) {
1541                         if (!dir_emit(ctx, de->name, de->name_len,
1542                                       le32_to_cpu(de->inode),
1543                                       get_dtype(sb, de->file_type)))
1544                                 goto out;
1545                 }
1546                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1547         }
1548 out:
1549         kfree(dir_buf);
1550         brelse(iloc.bh);
1551         return ret;
1552 }
1553
1554 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1555                                         struct ext4_dir_entry_2 **parent_de,
1556                                         int *retval)
1557 {
1558         struct ext4_iloc iloc;
1559
1560         *retval = ext4_get_inode_loc(inode, &iloc);
1561         if (*retval)
1562                 return NULL;
1563
1564         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1565
1566         return iloc.bh;
1567 }
1568
1569 /*
1570  * Try to create the inline data for the new dir.
1571  * If it succeeds, return 0, otherwise return the error.
1572  * In case of ENOSPC, the caller should create the normal disk layout dir.
1573  */
1574 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1575                                struct inode *inode)
1576 {
1577         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1578         struct ext4_iloc iloc;
1579         struct ext4_dir_entry_2 *de;
1580
1581         ret = ext4_get_inode_loc(inode, &iloc);
1582         if (ret)
1583                 return ret;
1584
1585         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1586         if (ret)
1587                 goto out;
1588
1589         /*
1590          * For inline dir, we only save the inode information for the ".."
1591          * and create a fake dentry to cover the left space.
1592          */
1593         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1594         de->inode = cpu_to_le32(parent->i_ino);
1595         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1596         de->inode = 0;
1597         de->rec_len = ext4_rec_len_to_disk(
1598                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1599                                 inline_size);
1600         set_nlink(inode, 2);
1601         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1602 out:
1603         brelse(iloc.bh);
1604         return ret;
1605 }
1606
1607 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1608                                         const struct qstr *d_name,
1609                                         struct ext4_dir_entry_2 **res_dir,
1610                                         int *has_inline_data)
1611 {
1612         int ret;
1613         struct ext4_iloc iloc;
1614         void *inline_start;
1615         int inline_size;
1616
1617         if (ext4_get_inode_loc(dir, &iloc))
1618                 return NULL;
1619
1620         down_read(&EXT4_I(dir)->xattr_sem);
1621         if (!ext4_has_inline_data(dir)) {
1622                 *has_inline_data = 0;
1623                 goto out;
1624         }
1625
1626         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1627                                                 EXT4_INLINE_DOTDOT_SIZE;
1628         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1629         ret = search_dir(iloc.bh, inline_start, inline_size,
1630                          dir, d_name, 0, res_dir);
1631         if (ret == 1)
1632                 goto out_find;
1633         if (ret < 0)
1634                 goto out;
1635
1636         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1637                 goto out;
1638
1639         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1640         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1641
1642         ret = search_dir(iloc.bh, inline_start, inline_size,
1643                          dir, d_name, 0, res_dir);
1644         if (ret == 1)
1645                 goto out_find;
1646
1647 out:
1648         brelse(iloc.bh);
1649         iloc.bh = NULL;
1650 out_find:
1651         up_read(&EXT4_I(dir)->xattr_sem);
1652         return iloc.bh;
1653 }
1654
1655 int ext4_delete_inline_entry(handle_t *handle,
1656                              struct inode *dir,
1657                              struct ext4_dir_entry_2 *de_del,
1658                              struct buffer_head *bh,
1659                              int *has_inline_data)
1660 {
1661         int err, inline_size;
1662         struct ext4_iloc iloc;
1663         void *inline_start;
1664
1665         err = ext4_get_inode_loc(dir, &iloc);
1666         if (err)
1667                 return err;
1668
1669         down_write(&EXT4_I(dir)->xattr_sem);
1670         if (!ext4_has_inline_data(dir)) {
1671                 *has_inline_data = 0;
1672                 goto out;
1673         }
1674
1675         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1676                 EXT4_MIN_INLINE_DATA_SIZE) {
1677                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1678                                         EXT4_INLINE_DOTDOT_SIZE;
1679                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1680                                 EXT4_INLINE_DOTDOT_SIZE;
1681         } else {
1682                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1683                 inline_size = ext4_get_inline_size(dir) -
1684                                 EXT4_MIN_INLINE_DATA_SIZE;
1685         }
1686
1687         BUFFER_TRACE(bh, "get_write_access");
1688         err = ext4_journal_get_write_access(handle, bh);
1689         if (err)
1690                 goto out;
1691
1692         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1693                                         inline_start, inline_size, 0);
1694         if (err)
1695                 goto out;
1696
1697         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1698         err = ext4_mark_inode_dirty(handle, dir);
1699         if (unlikely(err))
1700                 goto out;
1701
1702         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1703 out:
1704         up_write(&EXT4_I(dir)->xattr_sem);
1705         brelse(iloc.bh);
1706         if (err != -ENOENT)
1707                 ext4_std_error(dir->i_sb, err);
1708         return err;
1709 }
1710
1711 /*
1712  * Get the inline dentry at offset.
1713  */
1714 static inline struct ext4_dir_entry_2 *
1715 ext4_get_inline_entry(struct inode *inode,
1716                       struct ext4_iloc *iloc,
1717                       unsigned int offset,
1718                       void **inline_start,
1719                       int *inline_size)
1720 {
1721         void *inline_pos;
1722
1723         BUG_ON(offset > ext4_get_inline_size(inode));
1724
1725         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1726                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1727                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1728         } else {
1729                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1730                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1731                 *inline_size = ext4_get_inline_size(inode) -
1732                                 EXT4_MIN_INLINE_DATA_SIZE;
1733         }
1734
1735         if (inline_start)
1736                 *inline_start = inline_pos;
1737         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1738 }
1739
1740 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1741 {
1742         int err, inline_size;
1743         struct ext4_iloc iloc;
1744         void *inline_pos;
1745         unsigned int offset;
1746         struct ext4_dir_entry_2 *de;
1747         int ret = 1;
1748
1749         err = ext4_get_inode_loc(dir, &iloc);
1750         if (err) {
1751                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1752                                  err, dir->i_ino);
1753                 return 1;
1754         }
1755
1756         down_read(&EXT4_I(dir)->xattr_sem);
1757         if (!ext4_has_inline_data(dir)) {
1758                 *has_inline_data = 0;
1759                 goto out;
1760         }
1761
1762         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1763         if (!le32_to_cpu(de->inode)) {
1764                 ext4_warning(dir->i_sb,
1765                              "bad inline directory (dir #%lu) - no `..'",
1766                              dir->i_ino);
1767                 ret = 1;
1768                 goto out;
1769         }
1770
1771         offset = EXT4_INLINE_DOTDOT_SIZE;
1772         while (offset < dir->i_size) {
1773                 de = ext4_get_inline_entry(dir, &iloc, offset,
1774                                            &inline_pos, &inline_size);
1775                 if (ext4_check_dir_entry(dir, NULL, de,
1776                                          iloc.bh, inline_pos,
1777                                          inline_size, offset)) {
1778                         ext4_warning(dir->i_sb,
1779                                      "bad inline directory (dir #%lu) - "
1780                                      "inode %u, rec_len %u, name_len %d"
1781                                      "inline size %d\n",
1782                                      dir->i_ino, le32_to_cpu(de->inode),
1783                                      le16_to_cpu(de->rec_len), de->name_len,
1784                                      inline_size);
1785                         ret = 1;
1786                         goto out;
1787                 }
1788                 if (le32_to_cpu(de->inode)) {
1789                         ret = 0;
1790                         goto out;
1791                 }
1792                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1793         }
1794
1795 out:
1796         up_read(&EXT4_I(dir)->xattr_sem);
1797         brelse(iloc.bh);
1798         return ret;
1799 }
1800
1801 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1802 {
1803         int ret;
1804
1805         down_write(&EXT4_I(inode)->xattr_sem);
1806         ret = ext4_destroy_inline_data_nolock(handle, inode);
1807         up_write(&EXT4_I(inode)->xattr_sem);
1808
1809         return ret;
1810 }
1811
1812 int ext4_inline_data_fiemap(struct inode *inode,
1813                             struct fiemap_extent_info *fieinfo,
1814                             int *has_inline, __u64 start, __u64 len)
1815 {
1816         __u64 physical = 0;
1817         __u64 inline_len;
1818         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1819                 FIEMAP_EXTENT_LAST;
1820         int error = 0;
1821         struct ext4_iloc iloc;
1822
1823         down_read(&EXT4_I(inode)->xattr_sem);
1824         if (!ext4_has_inline_data(inode)) {
1825                 *has_inline = 0;
1826                 goto out;
1827         }
1828         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1829                            i_size_read(inode));
1830         if (start >= inline_len)
1831                 goto out;
1832         if (start + len < inline_len)
1833                 inline_len = start + len;
1834         inline_len -= start;
1835
1836         error = ext4_get_inode_loc(inode, &iloc);
1837         if (error)
1838                 goto out;
1839
1840         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1841         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1842         physical += offsetof(struct ext4_inode, i_block);
1843
1844         if (physical)
1845                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1846                                                 inline_len, flags);
1847         brelse(iloc.bh);
1848 out:
1849         up_read(&EXT4_I(inode)->xattr_sem);
1850         return (error < 0 ? error : 0);
1851 }
1852
1853 /*
1854  * Called during xattr set, and if we can sparse space 'needed',
1855  * just create the extent tree evict the data to the outer block.
1856  *
1857  * We use jbd2 instead of page cache to move data to the 1st block
1858  * so that the whole transaction can be committed as a whole and
1859  * the data isn't lost because of the delayed page cache write.
1860  */
1861 int ext4_try_to_evict_inline_data(handle_t *handle,
1862                                   struct inode *inode,
1863                                   int needed)
1864 {
1865         int error;
1866         struct ext4_xattr_entry *entry;
1867         struct ext4_inode *raw_inode;
1868         struct ext4_iloc iloc;
1869
1870         error = ext4_get_inode_loc(inode, &iloc);
1871         if (error)
1872                 return error;
1873
1874         raw_inode = ext4_raw_inode(&iloc);
1875         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1876                                             EXT4_I(inode)->i_inline_off);
1877         if (EXT4_XATTR_LEN(entry->e_name_len) +
1878             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1879                 error = -ENOSPC;
1880                 goto out;
1881         }
1882
1883         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1884 out:
1885         brelse(iloc.bh);
1886         return error;
1887 }
1888
1889 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1890 {
1891         handle_t *handle;
1892         int inline_size, value_len, needed_blocks;
1893         size_t i_size;
1894         void *value = NULL;
1895         struct ext4_xattr_ibody_find is = {
1896                 .s = { .not_found = -ENODATA, },
1897         };
1898         struct ext4_xattr_info i = {
1899                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1900                 .name = EXT4_XATTR_SYSTEM_DATA,
1901         };
1902
1903
1904         needed_blocks = ext4_writepage_trans_blocks(inode);
1905         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1906         if (IS_ERR(handle))
1907                 return;
1908
1909         down_write(&EXT4_I(inode)->xattr_sem);
1910         if (!ext4_has_inline_data(inode)) {
1911                 *has_inline = 0;
1912                 ext4_journal_stop(handle);
1913                 return;
1914         }
1915
1916         if (ext4_orphan_add(handle, inode))
1917                 goto out;
1918
1919         if (ext4_get_inode_loc(inode, &is.iloc))
1920                 goto out;
1921
1922         down_write(&EXT4_I(inode)->i_data_sem);
1923         i_size = inode->i_size;
1924         inline_size = ext4_get_inline_size(inode);
1925         EXT4_I(inode)->i_disksize = i_size;
1926
1927         if (i_size < inline_size) {
1928                 /* Clear the content in the xattr space. */
1929                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1930                         if (ext4_xattr_ibody_find(inode, &i, &is))
1931                                 goto out_error;
1932
1933                         BUG_ON(is.s.not_found);
1934
1935                         value_len = le32_to_cpu(is.s.here->e_value_size);
1936                         value = kmalloc(value_len, GFP_NOFS);
1937                         if (!value)
1938                                 goto out_error;
1939
1940                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1941                                                 value, value_len))
1942                                 goto out_error;
1943
1944                         i.value = value;
1945                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1946                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1947                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1948                                 goto out_error;
1949                 }
1950
1951                 /* Clear the content within i_blocks. */
1952                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1953                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1954                         memset(p + i_size, 0,
1955                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1956                 }
1957
1958                 EXT4_I(inode)->i_inline_size = i_size <
1959                                         EXT4_MIN_INLINE_DATA_SIZE ?
1960                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1961         }
1962
1963 out_error:
1964         up_write(&EXT4_I(inode)->i_data_sem);
1965 out:
1966         brelse(is.iloc.bh);
1967         up_write(&EXT4_I(inode)->xattr_sem);
1968         kfree(value);
1969         if (inode->i_nlink)
1970                 ext4_orphan_del(handle, inode);
1971
1972         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1973         ext4_mark_inode_dirty(handle, inode);
1974         if (IS_SYNC(inode))
1975                 ext4_handle_sync(handle);
1976
1977         ext4_journal_stop(handle);
1978         return;
1979 }
1980
1981 int ext4_convert_inline_data(struct inode *inode)
1982 {
1983         int error, needed_blocks;
1984         handle_t *handle;
1985         struct ext4_iloc iloc;
1986
1987         if (!ext4_has_inline_data(inode)) {
1988                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1989                 return 0;
1990         }
1991
1992         needed_blocks = ext4_writepage_trans_blocks(inode);
1993
1994         iloc.bh = NULL;
1995         error = ext4_get_inode_loc(inode, &iloc);
1996         if (error)
1997                 return error;
1998
1999         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2000         if (IS_ERR(handle)) {
2001                 error = PTR_ERR(handle);
2002                 goto out_free;
2003         }
2004
2005         down_write(&EXT4_I(inode)->xattr_sem);
2006         if (!ext4_has_inline_data(inode)) {
2007                 up_write(&EXT4_I(inode)->xattr_sem);
2008                 goto out;
2009         }
2010
2011         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2012         up_write(&EXT4_I(inode)->xattr_sem);
2013 out:
2014         ext4_journal_stop(handle);
2015 out_free:
2016         brelse(iloc.bh);
2017         return error;
2018 }