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                 ext4_orphan_add(handle, inode);
 598                 up_write(&EXT4_I(inode)->xattr_sem);
 599                 sem_held = 0;
 600                 ext4_journal_stop(handle);
 601                 handle = NULL;
 602                 ext4_truncate_failed_write(inode);
 603                 /*
 604                  * If truncate failed early the inode might
 605                  * still be on the orphan list; we need to
 606                  * make sure the inode is removed from the
 607                  * orphan list in that case.
 608                  */
 609                 if (inode->i_nlink)
 610                         ext4_orphan_del(NULL, inode);
 611         }
 612
 613         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 614                 goto retry;
 615
 616         block_commit_write(page, from, to);
 617 out:
 618         if (page) {
 619                 unlock_page(page);
 620                 page_cache_release(page);
 621         }
 622         if (sem_held)
 623                 up_write(&EXT4_I(inode)->xattr_sem);
 624         if (handle)
 625                 ext4_journal_stop(handle);
 626         brelse(iloc.bh);
 627         return ret;
 628 }
 629
 630 /*
 631  * Try to write data in the inode.
 632  * If the inode has inline data, check whether the new write can be
 633  * in the inode also. If not, create the page the handle, move the data
 634  * to the page make it update and let the later codes create extent for it.
 635  */
 636 int ext4_try_to_write_inline_data(struct address_space *mapping,
 637                                   struct inode *inode,
 638                                   loff_t pos, unsigned len,
 639                                   unsigned flags,
 640                                   struct page **pagep)
 641 {
 642         int ret;
 643         handle_t *handle;
 644         struct page *page;
 645         struct ext4_iloc iloc;
 646
 647         if (pos + len > ext4_get_max_inline_size(inode))
 648                 goto convert;
 649
 650         ret = ext4_get_inode_loc(inode, &iloc);
 651         if (ret)
 652                 return ret;
 653
 654         /*
 655          * The possible write could happen in the inode,
 656          * so try to reserve the space in inode first.
 657          */
 658         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 659         if (IS_ERR(handle)) {
 660                 ret = PTR_ERR(handle);
 661                 handle = NULL;
 662                 goto out;
 663         }
 664
 665         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 666         if (ret && ret != -ENOSPC)
 667                 goto out;
 668
 669         /* We don't have space in inline inode, so convert it to extent. */
 670         if (ret == -ENOSPC) {
 671                 ext4_journal_stop(handle);
 672                 brelse(iloc.bh);
 673                 goto convert;
 674         }
 675
 676         flags |= AOP_FLAG_NOFS;
 677
 678         page = grab_cache_page_write_begin(mapping, 0, flags);
 679         if (!page) {
 680                 ret = -ENOMEM;
 681                 goto out;
 682         }
 683
 684         *pagep = page;
 685         down_read(&EXT4_I(inode)->xattr_sem);
 686         if (!ext4_has_inline_data(inode)) {
 687                 ret = 0;
 688                 unlock_page(page);
 689                 page_cache_release(page);
 690                 goto out_up_read;
 691         }
 692
 693         if (!PageUptodate(page)) {
 694                 ret = ext4_read_inline_page(inode, page);
 695                 if (ret < 0)
 696                         goto out_up_read;
 697         }
 698
 699         ret = 1;
 700         handle = NULL;
 701 out_up_read:
 702         up_read(&EXT4_I(inode)->xattr_sem);
 703 out:
 704         if (handle)
 705                 ext4_journal_stop(handle);
 706         brelse(iloc.bh);
 707         return ret;
 708 convert:
 709         return ext4_convert_inline_data_to_extent(mapping,
 710                                                   inode, flags);
 711 }
 712
 713 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 714                                unsigned copied, struct page *page)
 715 {
 716         int ret;
 717         void *kaddr;
 718         struct ext4_iloc iloc;
 719
 720         if (unlikely(copied < len)) {
 721                 if (!PageUptodate(page)) {
 722                         copied = 0;
 723                         goto out;
 724                 }
 725         }
 726
 727         ret = ext4_get_inode_loc(inode, &iloc);
 728         if (ret) {
 729                 ext4_std_error(inode->i_sb, ret);
 730                 copied = 0;
 731                 goto out;
 732         }
 733
 734         down_write(&EXT4_I(inode)->xattr_sem);
 735         BUG_ON(!ext4_has_inline_data(inode));
 736
 737         kaddr = kmap_atomic(page);
 738         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 739         kunmap_atomic(kaddr);
 740         SetPageUptodate(page);
 741         /* clear page dirty so that writepages wouldn't work for us. */
 742         ClearPageDirty(page);
 743
 744         up_write(&EXT4_I(inode)->xattr_sem);
 745         brelse(iloc.bh);
 746 out:
 747         return copied;
 748 }
 749
 750 struct buffer_head *
 751 ext4_journalled_write_inline_data(struct inode *inode,
 752                                   unsigned len,
 753                                   struct page *page)
 754 {
 755         int ret;
 756         void *kaddr;
 757         struct ext4_iloc iloc;
 758
 759         ret = ext4_get_inode_loc(inode, &iloc);
 760         if (ret) {
 761                 ext4_std_error(inode->i_sb, ret);
 762                 return NULL;
 763         }
 764
 765         down_write(&EXT4_I(inode)->xattr_sem);
 766         kaddr = kmap_atomic(page);
 767         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 768         kunmap_atomic(kaddr);
 769         up_write(&EXT4_I(inode)->xattr_sem);
 770
 771         return iloc.bh;
 772 }
 773
 774 /*
 775  * Try to make the page cache and handle ready for the inline data case.
 776  * We can call this function in 2 cases:
 777  * 1. The inode is created and the first write exceeds inline size. We can
 778  *    clear the inode state safely.
 779  * 2. The inode has inline data, then we need to read the data, make it
 780  *    update and dirty so that ext4_da_writepages can handle it. We don't
 781  *    need to start the journal since the file's metatdata isn't changed now.
 782  */
 783 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 784                                                  struct inode *inode,
 785                                                  unsigned flags,
 786                                                  void **fsdata)
 787 {
 788         int ret = 0, inline_size;
 789         struct page *page;
 790
 791         page = grab_cache_page_write_begin(mapping, 0, flags);
 792         if (!page)
 793                 return -ENOMEM;
 794
 795         down_read(&EXT4_I(inode)->xattr_sem);
 796         if (!ext4_has_inline_data(inode)) {
 797                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 798                 goto out;
 799         }
 800
 801         inline_size = ext4_get_inline_size(inode);
 802
 803         if (!PageUptodate(page)) {
 804                 ret = ext4_read_inline_page(inode, page);
 805                 if (ret < 0)
 806                         goto out;
 807         }
 808
 809         ret = __block_write_begin(page, 0, inline_size,
 810                                   ext4_da_get_block_prep);
 811         if (ret) {
 812                 ext4_truncate_failed_write(inode);
 813                 goto out;
 814         }
 815
 816         SetPageDirty(page);
 817         SetPageUptodate(page);
 818         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 819         *fsdata = (void *)CONVERT_INLINE_DATA;
 820
 821 out:
 822         up_read(&EXT4_I(inode)->xattr_sem);
 823         if (page) {
 824                 unlock_page(page);
 825                 page_cache_release(page);
 826         }
 827         return ret;
 828 }
 829
 830 /*
 831  * Prepare the write for the inline data.
 832  * If the the data can be written into the inode, we just read
 833  * the page and make it uptodate, and start the journal.
 834  * Otherwise read the page, makes it dirty so that it can be
 835  * handle in writepages(the i_disksize update is left to the
 836  * normal ext4_da_write_end).
 837  */
 838 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 839                                     struct inode *inode,
 840                                     loff_t pos, unsigned len,
 841                                     unsigned flags,
 842                                     struct page **pagep,
 843                                     void **fsdata)
 844 {
 845         int ret, inline_size;
 846         handle_t *handle;
 847         struct page *page;
 848         struct ext4_iloc iloc;
 849         int retries;
 850
 851         ret = ext4_get_inode_loc(inode, &iloc);
 852         if (ret)
 853                 return ret;
 854
 855 retry_journal:
 856         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 857         if (IS_ERR(handle)) {
 858                 ret = PTR_ERR(handle);
 859                 goto out;
 860         }
 861
 862         inline_size = ext4_get_max_inline_size(inode);
 863
 864         ret = -ENOSPC;
 865         if (inline_size >= pos + len) {
 866                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 867                 if (ret && ret != -ENOSPC)
 868                         goto out_journal;
 869         }
 870
 871         if (ret == -ENOSPC) {
 872                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 873                                                             inode,
 874                                                             flags,
 875                                                             fsdata);
 876                 ext4_journal_stop(handle);
 877                 if (ret == -ENOSPC &&
 878                     ext4_should_retry_alloc(inode->i_sb, &retries))
 879                         goto retry_journal;
 880                 goto out;
 881         }
 882
 883         /*
 884          * We cannot recurse into the filesystem as the transaction
 885          * is already started.
 886          */
 887         flags |= AOP_FLAG_NOFS;
 888
 889         page = grab_cache_page_write_begin(mapping, 0, flags);
 890         if (!page) {
 891                 ret = -ENOMEM;
 892                 goto out_journal;
 893         }
 894
 895         down_read(&EXT4_I(inode)->xattr_sem);
 896         if (!ext4_has_inline_data(inode)) {
 897                 ret = 0;
 898                 goto out_release_page;
 899         }
 900
 901         if (!PageUptodate(page)) {
 902                 ret = ext4_read_inline_page(inode, page);
 903                 if (ret < 0)
 904                         goto out_release_page;
 905         }
 906
 907         up_read(&EXT4_I(inode)->xattr_sem);
 908         *pagep = page;
 909         brelse(iloc.bh);
 910         return 1;
 911 out_release_page:
 912         up_read(&EXT4_I(inode)->xattr_sem);
 913         unlock_page(page);
 914         page_cache_release(page);
 915 out_journal:
 916         ext4_journal_stop(handle);
 917 out:
 918         brelse(iloc.bh);
 919         return ret;
 920 }
 921
 922 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 923                                   unsigned len, unsigned copied,
 924                                   struct page *page)
 925 {
 926         int i_size_changed = 0;
 927
 928         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 929
 930         /*
 931          * No need to use i_size_read() here, the i_size
 932          * cannot change under us because we hold i_mutex.
 933          *
 934          * But it's important to update i_size while still holding page lock:
 935          * page writeout could otherwise come in and zero beyond i_size.
 936          */
 937         if (pos+copied > inode->i_size) {
 938                 i_size_write(inode, pos+copied);
 939                 i_size_changed = 1;
 940         }
 941         unlock_page(page);
 942         page_cache_release(page);
 943
 944         /*
 945          * Don't mark the inode dirty under page lock. First, it unnecessarily
 946          * makes the holding time of page lock longer. Second, it forces lock
 947          * ordering of page lock and transaction start for journaling
 948          * filesystems.
 949          */
 950         if (i_size_changed)
 951                 mark_inode_dirty(inode);
 952
 953         return copied;
 954 }
 955
 956 #ifdef INLINE_DIR_DEBUG
 957 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 958                           void *inline_start, int inline_size)
 959 {
 960         int offset;
 961         unsigned short de_len;
 962         struct ext4_dir_entry_2 *de = inline_start;
 963         void *dlimit = inline_start + inline_size;
 964
 965         trace_printk("inode %lu\n", dir->i_ino);
 966         offset = 0;
 967         while ((void *)de < dlimit) {
 968                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 969                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
 970                              offset, de_len, de->name_len, de->name,
 971                              de->name_len, le32_to_cpu(de->inode));
 972                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 973                                          inline_start, inline_size, offset))
 974                         BUG();
 975
 976                 offset += de_len;
 977                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 978         }
 979 }
 980 #else
 981 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 982 #endif
 983
 984 /*
 985  * Add a new entry into a inline dir.
 986  * It will return -ENOSPC if no space is available, and -EIO
 987  * and -EEXIST if directory entry already exists.
 988  */
 989 static int ext4_add_dirent_to_inline(handle_t *handle,
 990                                      struct dentry *dentry,
 991                                      struct inode *inode,
 992                                      struct ext4_iloc *iloc,
 993                                      void *inline_start, int inline_size)
 994 {
 995         struct inode    *dir = dentry->d_parent->d_inode;
 996         const char      *name = dentry->d_name.name;
 997         int             namelen = dentry->d_name.len;
 998         int             err;
 999         struct ext4_dir_entry_2 *de;
1000
1001         err = ext4_find_dest_de(dir, inode, iloc->bh,
1002                                 inline_start, inline_size,
1003                                 name, namelen, &de);
1004         if (err)
1005                 return err;
1006
1007         BUFFER_TRACE(iloc->bh, "get_write_access");
1008         err = ext4_journal_get_write_access(handle, iloc->bh);
1009         if (err)
1010                 return err;
1011         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1012
1013         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1014
1015         /*
1016          * XXX shouldn't update any times until successful
1017          * completion of syscall, but too many callers depend
1018          * on this.
1019          *
1020          * XXX similarly, too many callers depend on
1021          * ext4_new_inode() setting the times, but error
1022          * recovery deletes the inode, so the worst that can
1023          * happen is that the times are slightly out of date
1024          * and/or different from the directory change time.
1025          */
1026         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1027         ext4_update_dx_flag(dir);
1028         dir->i_version++;
1029         ext4_mark_inode_dirty(handle, dir);
1030         return 1;
1031 }
1032
1033 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1034                                        struct ext4_iloc *iloc)
1035 {
1036         struct ext4_xattr_entry *entry;
1037         struct ext4_xattr_ibody_header *header;
1038
1039         BUG_ON(!EXT4_I(inode)->i_inline_off);
1040
1041         header = IHDR(inode, ext4_raw_inode(iloc));
1042         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1043                                             EXT4_I(inode)->i_inline_off);
1044
1045         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1046 }
1047
1048 /* Set the final de to cover the whole block. */
1049 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1050 {
1051         struct ext4_dir_entry_2 *de, *prev_de;
1052         void *limit;
1053         int de_len;
1054
1055         de = (struct ext4_dir_entry_2 *)de_buf;
1056         if (old_size) {
1057                 limit = de_buf + old_size;
1058                 do {
1059                         prev_de = de;
1060                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1061                         de_buf += de_len;
1062                         de = (struct ext4_dir_entry_2 *)de_buf;
1063                 } while (de_buf < limit);
1064
1065                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1066                                                         old_size, new_size);
1067         } else {
1068                 /* this is just created, so create an empty entry. */
1069                 de->inode = 0;
1070                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1071         }
1072 }
1073
1074 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1075                                   struct ext4_iloc *iloc)
1076 {
1077         int ret;
1078         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1079         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1080
1081         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1082                 return -ENOSPC;
1083
1084         ret = ext4_update_inline_data(handle, dir,
1085                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1086         if (ret)
1087                 return ret;
1088
1089         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1090                              EXT4_I(dir)->i_inline_size -
1091                                                 EXT4_MIN_INLINE_DATA_SIZE);
1092         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1093         return 0;
1094 }
1095
1096 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1097                                      struct ext4_iloc *iloc,
1098                                      void *buf, int inline_size)
1099 {
1100         ext4_create_inline_data(handle, inode, inline_size);
1101         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1102         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1103 }
1104
1105 static int ext4_finish_convert_inline_dir(handle_t *handle,
1106                                           struct inode *inode,
1107                                           struct buffer_head *dir_block,
1108                                           void *buf,
1109                                           int inline_size)
1110 {
1111         int err, csum_size = 0, header_size = 0;
1112         struct ext4_dir_entry_2 *de;
1113         struct ext4_dir_entry_tail *t;
1114         void *target = dir_block->b_data;
1115
1116         /*
1117          * First create "." and ".." and then copy the dir information
1118          * back to the block.
1119          */
1120         de = (struct ext4_dir_entry_2 *)target;
1121         de = ext4_init_dot_dotdot(inode, de,
1122                 inode->i_sb->s_blocksize, csum_size,
1123                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1124         header_size = (void *)de - target;
1125
1126         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1127                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1128
1129         if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
1130                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
1131                 csum_size = sizeof(struct ext4_dir_entry_tail);
1132
1133         inode->i_size = inode->i_sb->s_blocksize;
1134         i_size_write(inode, inode->i_sb->s_blocksize);
1135         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1136         ext4_update_final_de(dir_block->b_data,
1137                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1138                         inode->i_sb->s_blocksize - csum_size);
1139
1140         if (csum_size) {
1141                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1142                                      inode->i_sb->s_blocksize);
1143                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1144         }
1145         set_buffer_uptodate(dir_block);
1146         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1147         if (err)
1148                 goto out;
1149         set_buffer_verified(dir_block);
1150 out:
1151         return err;
1152 }
1153
1154 static int ext4_convert_inline_data_nolock(handle_t *handle,
1155                                            struct inode *inode,
1156                                            struct ext4_iloc *iloc)
1157 {
1158         int error;
1159         void *buf = NULL;
1160         struct buffer_head *data_bh = NULL;
1161         struct ext4_map_blocks map;
1162         int inline_size;
1163
1164         inline_size = ext4_get_inline_size(inode);
1165         buf = kmalloc(inline_size, GFP_NOFS);
1166         if (!buf) {
1167                 error = -ENOMEM;
1168                 goto out;
1169         }
1170
1171         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1172         if (error < 0)
1173                 goto out;
1174
1175         /*
1176          * Make sure the inline directory entries pass checks before we try to
1177          * convert them, so that we avoid touching stuff that needs fsck.
1178          */
1179         if (S_ISDIR(inode->i_mode)) {
1180                 error = ext4_check_all_de(inode, iloc->bh,
1181                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1182                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1183                 if (error)
1184                         goto out;
1185         }
1186
1187         error = ext4_destroy_inline_data_nolock(handle, inode);
1188         if (error)
1189                 goto out;
1190
1191         map.m_lblk = 0;
1192         map.m_len = 1;
1193         map.m_flags = 0;
1194         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1195         if (error < 0)
1196                 goto out_restore;
1197         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1198                 error = -EIO;
1199                 goto out_restore;
1200         }
1201
1202         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1203         if (!data_bh) {
1204                 error = -ENOMEM;
1205                 goto out_restore;
1206         }
1207
1208         lock_buffer(data_bh);
1209         error = ext4_journal_get_create_access(handle, data_bh);
1210         if (error) {
1211                 unlock_buffer(data_bh);
1212                 error = -EIO;
1213                 goto out_restore;
1214         }
1215         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1216
1217         if (!S_ISDIR(inode->i_mode)) {
1218                 memcpy(data_bh->b_data, buf, inline_size);
1219                 set_buffer_uptodate(data_bh);
1220                 error = ext4_handle_dirty_metadata(handle,
1221                                                    inode, data_bh);
1222         } else {
1223                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1224                                                        buf, inline_size);
1225         }
1226
1227         unlock_buffer(data_bh);
1228 out_restore:
1229         if (error)
1230                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1231
1232 out:
1233         brelse(data_bh);
1234         kfree(buf);
1235         return error;
1236 }
1237
1238 /*
1239  * Try to add the new entry to the inline data.
1240  * If succeeds, return 0. If not, extended the inline dir and copied data to
1241  * the new created block.
1242  */
1243 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1244                               struct inode *inode)
1245 {
1246         int ret, inline_size;
1247         void *inline_start;
1248         struct ext4_iloc iloc;
1249         struct inode *dir = dentry->d_parent->d_inode;
1250
1251         ret = ext4_get_inode_loc(dir, &iloc);
1252         if (ret)
1253                 return ret;
1254
1255         down_write(&EXT4_I(dir)->xattr_sem);
1256         if (!ext4_has_inline_data(dir))
1257                 goto out;
1258
1259         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1260                                                  EXT4_INLINE_DOTDOT_SIZE;
1261         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1262
1263         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1264                                         inline_start, inline_size);
1265         if (ret != -ENOSPC)
1266                 goto out;
1267
1268         /* check whether it can be inserted to inline xattr space. */
1269         inline_size = EXT4_I(dir)->i_inline_size -
1270                         EXT4_MIN_INLINE_DATA_SIZE;
1271         if (!inline_size) {
1272                 /* Try to use the xattr space.*/
1273                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1274                 if (ret && ret != -ENOSPC)
1275                         goto out;
1276
1277                 inline_size = EXT4_I(dir)->i_inline_size -
1278                                 EXT4_MIN_INLINE_DATA_SIZE;
1279         }
1280
1281         if (inline_size) {
1282                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1283
1284                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1285                                                 inline_start, inline_size);
1286
1287                 if (ret != -ENOSPC)
1288                         goto out;
1289         }
1290
1291         /*
1292          * The inline space is filled up, so create a new block for it.
1293          * As the extent tree will be created, we have to save the inline
1294          * dir first.
1295          */
1296         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1297
1298 out:
1299         ext4_mark_inode_dirty(handle, dir);
1300         up_write(&EXT4_I(dir)->xattr_sem);
1301         brelse(iloc.bh);
1302         return ret;
1303 }
1304
1305 /*
1306  * This function fills a red-black tree with information from an
1307  * inlined dir.  It returns the number directory entries loaded
1308  * into the tree.  If there is an error it is returned in err.
1309  */
1310 int htree_inlinedir_to_tree(struct file *dir_file,
1311                             struct inode *dir, ext4_lblk_t block,
1312                             struct dx_hash_info *hinfo,
1313                             __u32 start_hash, __u32 start_minor_hash,
1314                             int *has_inline_data)
1315 {
1316         int err = 0, count = 0;
1317         unsigned int parent_ino;
1318         int pos;
1319         struct ext4_dir_entry_2 *de;
1320         struct inode *inode = file_inode(dir_file);
1321         int ret, inline_size = 0;
1322         struct ext4_iloc iloc;
1323         void *dir_buf = NULL;
1324         struct ext4_dir_entry_2 fake;
1325
1326         ret = ext4_get_inode_loc(inode, &iloc);
1327         if (ret)
1328                 return ret;
1329
1330         down_read(&EXT4_I(inode)->xattr_sem);
1331         if (!ext4_has_inline_data(inode)) {
1332                 up_read(&EXT4_I(inode)->xattr_sem);
1333                 *has_inline_data = 0;
1334                 goto out;
1335         }
1336
1337         inline_size = ext4_get_inline_size(inode);
1338         dir_buf = kmalloc(inline_size, GFP_NOFS);
1339         if (!dir_buf) {
1340                 ret = -ENOMEM;
1341                 up_read(&EXT4_I(inode)->xattr_sem);
1342                 goto out;
1343         }
1344
1345         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1346         up_read(&EXT4_I(inode)->xattr_sem);
1347         if (ret < 0)
1348                 goto out;
1349
1350         pos = 0;
1351         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1352         while (pos < inline_size) {
1353                 /*
1354                  * As inlined dir doesn't store any information about '.' and
1355                  * only the inode number of '..' is stored, we have to handle
1356                  * them differently.
1357                  */
1358                 if (pos == 0) {
1359                         fake.inode = cpu_to_le32(inode->i_ino);
1360                         fake.name_len = 1;
1361                         strcpy(fake.name, ".");
1362                         fake.rec_len = ext4_rec_len_to_disk(
1363                                                 EXT4_DIR_REC_LEN(fake.name_len),
1364                                                 inline_size);
1365                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1366                         de = &fake;
1367                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1368                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1369                         fake.inode = cpu_to_le32(parent_ino);
1370                         fake.name_len = 2;
1371                         strcpy(fake.name, "..");
1372                         fake.rec_len = ext4_rec_len_to_disk(
1373                                                 EXT4_DIR_REC_LEN(fake.name_len),
1374                                                 inline_size);
1375                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1376                         de = &fake;
1377                         pos = EXT4_INLINE_DOTDOT_SIZE;
1378                 } else {
1379                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1380                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1381                         if (ext4_check_dir_entry(inode, dir_file, de,
1382                                          iloc.bh, dir_buf,
1383                                          inline_size, pos)) {
1384                                 ret = count;
1385                                 goto out;
1386                         }
1387                 }
1388
1389                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1390                 if ((hinfo->hash < start_hash) ||
1391                     ((hinfo->hash == start_hash) &&
1392                      (hinfo->minor_hash < start_minor_hash)))
1393                         continue;
1394                 if (de->inode == 0)
1395                         continue;
1396                 err = ext4_htree_store_dirent(dir_file,
1397                                    hinfo->hash, hinfo->minor_hash, de);
1398                 if (err) {
1399                         count = err;
1400                         goto out;
1401                 }
1402                 count++;
1403         }
1404         ret = count;
1405 out:
1406         kfree(dir_buf);
1407         brelse(iloc.bh);
1408         return ret;
1409 }
1410
1411 /*
1412  * So this function is called when the volume is mkfsed with
1413  * dir_index disabled. In order to keep f_pos persistent
1414  * after we convert from an inlined dir to a blocked based,
1415  * we just pretend that we are a normal dir and return the
1416  * offset as if '.' and '..' really take place.
1417  *
1418  */
1419 int ext4_read_inline_dir(struct file *file,
1420                          struct dir_context *ctx,
1421                          int *has_inline_data)
1422 {
1423         unsigned int offset, parent_ino;
1424         int i;
1425         struct ext4_dir_entry_2 *de;
1426         struct super_block *sb;
1427         struct inode *inode = file_inode(file);
1428         int ret, inline_size = 0;
1429         struct ext4_iloc iloc;
1430         void *dir_buf = NULL;
1431         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1432
1433         ret = ext4_get_inode_loc(inode, &iloc);
1434         if (ret)
1435                 return ret;
1436
1437         down_read(&EXT4_I(inode)->xattr_sem);
1438         if (!ext4_has_inline_data(inode)) {
1439                 up_read(&EXT4_I(inode)->xattr_sem);
1440                 *has_inline_data = 0;
1441                 goto out;
1442         }
1443
1444         inline_size = ext4_get_inline_size(inode);
1445         dir_buf = kmalloc(inline_size, GFP_NOFS);
1446         if (!dir_buf) {
1447                 ret = -ENOMEM;
1448                 up_read(&EXT4_I(inode)->xattr_sem);
1449                 goto out;
1450         }
1451
1452         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1453         up_read(&EXT4_I(inode)->xattr_sem);
1454         if (ret < 0)
1455                 goto out;
1456
1457         ret = 0;
1458         sb = inode->i_sb;
1459         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1460         offset = ctx->pos;
1461
1462         /*
1463          * dotdot_offset and dotdot_size is the real offset and
1464          * size for ".." and "." if the dir is block based while
1465          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1466          * So we will use extra_offset and extra_size to indicate them
1467          * during the inline dir iteration.
1468          */
1469         dotdot_offset = EXT4_DIR_REC_LEN(1);
1470         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1471         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1472         extra_size = extra_offset + inline_size;
1473
1474         /*
1475          * If the version has changed since the last call to
1476          * readdir(2), then we might be pointing to an invalid
1477          * dirent right now.  Scan from the start of the inline
1478          * dir to make sure.
1479          */
1480         if (file->f_version != inode->i_version) {
1481                 for (i = 0; i < extra_size && i < offset;) {
1482                         /*
1483                          * "." is with offset 0 and
1484                          * ".." is dotdot_offset.
1485                          */
1486                         if (!i) {
1487                                 i = dotdot_offset;
1488                                 continue;
1489                         } else if (i == dotdot_offset) {
1490                                 i = dotdot_size;
1491                                 continue;
1492                         }
1493                         /* for other entry, the real offset in
1494                          * the buf has to be tuned accordingly.
1495                          */
1496                         de = (struct ext4_dir_entry_2 *)
1497                                 (dir_buf + i - extra_offset);
1498                         /* It's too expensive to do a full
1499                          * dirent test each time round this
1500                          * loop, but we do have to test at
1501                          * least that it is non-zero.  A
1502                          * failure will be detected in the
1503                          * dirent test below. */
1504                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1505                                 < EXT4_DIR_REC_LEN(1))
1506                                 break;
1507                         i += ext4_rec_len_from_disk(de->rec_len,
1508                                                     extra_size);
1509                 }
1510                 offset = i;
1511                 ctx->pos = offset;
1512                 file->f_version = inode->i_version;
1513         }
1514
1515         while (ctx->pos < extra_size) {
1516                 if (ctx->pos == 0) {
1517                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1518                                 goto out;
1519                         ctx->pos = dotdot_offset;
1520                         continue;
1521                 }
1522
1523                 if (ctx->pos == dotdot_offset) {
1524                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1525                                 goto out;
1526                         ctx->pos = dotdot_size;
1527                         continue;
1528                 }
1529
1530                 de = (struct ext4_dir_entry_2 *)
1531                         (dir_buf + ctx->pos - extra_offset);
1532                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1533                                          extra_size, ctx->pos))
1534                         goto out;
1535                 if (le32_to_cpu(de->inode)) {
1536                         if (!dir_emit(ctx, de->name, de->name_len,
1537                                       le32_to_cpu(de->inode),
1538                                       get_dtype(sb, de->file_type)))
1539                                 goto out;
1540                 }
1541                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1542         }
1543 out:
1544         kfree(dir_buf);
1545         brelse(iloc.bh);
1546         return ret;
1547 }
1548
1549 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1550                                         struct ext4_dir_entry_2 **parent_de,
1551                                         int *retval)
1552 {
1553         struct ext4_iloc iloc;
1554
1555         *retval = ext4_get_inode_loc(inode, &iloc);
1556         if (*retval)
1557                 return NULL;
1558
1559         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1560
1561         return iloc.bh;
1562 }
1563
1564 /*
1565  * Try to create the inline data for the new dir.
1566  * If it succeeds, return 0, otherwise return the error.
1567  * In case of ENOSPC, the caller should create the normal disk layout dir.
1568  */
1569 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1570                                struct inode *inode)
1571 {
1572         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1573         struct ext4_iloc iloc;
1574         struct ext4_dir_entry_2 *de;
1575
1576         ret = ext4_get_inode_loc(inode, &iloc);
1577         if (ret)
1578                 return ret;
1579
1580         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1581         if (ret)
1582                 goto out;
1583
1584         /*
1585          * For inline dir, we only save the inode information for the ".."
1586          * and create a fake dentry to cover the left space.
1587          */
1588         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1589         de->inode = cpu_to_le32(parent->i_ino);
1590         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1591         de->inode = 0;
1592         de->rec_len = ext4_rec_len_to_disk(
1593                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1594                                 inline_size);
1595         set_nlink(inode, 2);
1596         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1597 out:
1598         brelse(iloc.bh);
1599         return ret;
1600 }
1601
1602 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1603                                         const struct qstr *d_name,
1604                                         struct ext4_dir_entry_2 **res_dir,
1605                                         int *has_inline_data)
1606 {
1607         int ret;
1608         struct ext4_iloc iloc;
1609         void *inline_start;
1610         int inline_size;
1611
1612         if (ext4_get_inode_loc(dir, &iloc))
1613                 return NULL;
1614
1615         down_read(&EXT4_I(dir)->xattr_sem);
1616         if (!ext4_has_inline_data(dir)) {
1617                 *has_inline_data = 0;
1618                 goto out;
1619         }
1620
1621         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1622                                                 EXT4_INLINE_DOTDOT_SIZE;
1623         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1624         ret = search_dir(iloc.bh, inline_start, inline_size,
1625                          dir, d_name, 0, res_dir);
1626         if (ret == 1)
1627                 goto out_find;
1628         if (ret < 0)
1629                 goto out;
1630
1631         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1632                 goto out;
1633
1634         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1635         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1636
1637         ret = search_dir(iloc.bh, inline_start, inline_size,
1638                          dir, d_name, 0, res_dir);
1639         if (ret == 1)
1640                 goto out_find;
1641
1642 out:
1643         brelse(iloc.bh);
1644         iloc.bh = NULL;
1645 out_find:
1646         up_read(&EXT4_I(dir)->xattr_sem);
1647         return iloc.bh;
1648 }
1649
1650 int ext4_delete_inline_entry(handle_t *handle,
1651                              struct inode *dir,
1652                              struct ext4_dir_entry_2 *de_del,
1653                              struct buffer_head *bh,
1654                              int *has_inline_data)
1655 {
1656         int err, inline_size;
1657         struct ext4_iloc iloc;
1658         void *inline_start;
1659
1660         err = ext4_get_inode_loc(dir, &iloc);
1661         if (err)
1662                 return err;
1663
1664         down_write(&EXT4_I(dir)->xattr_sem);
1665         if (!ext4_has_inline_data(dir)) {
1666                 *has_inline_data = 0;
1667                 goto out;
1668         }
1669
1670         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1671                 EXT4_MIN_INLINE_DATA_SIZE) {
1672                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1673                                         EXT4_INLINE_DOTDOT_SIZE;
1674                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1675                                 EXT4_INLINE_DOTDOT_SIZE;
1676         } else {
1677                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1678                 inline_size = ext4_get_inline_size(dir) -
1679                                 EXT4_MIN_INLINE_DATA_SIZE;
1680         }
1681
1682         BUFFER_TRACE(bh, "get_write_access");
1683         err = ext4_journal_get_write_access(handle, bh);
1684         if (err)
1685                 goto out;
1686
1687         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1688                                         inline_start, inline_size, 0);
1689         if (err)
1690                 goto out;
1691
1692         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1693         err = ext4_mark_inode_dirty(handle, dir);
1694         if (unlikely(err))
1695                 goto out;
1696
1697         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1698 out:
1699         up_write(&EXT4_I(dir)->xattr_sem);
1700         brelse(iloc.bh);
1701         if (err != -ENOENT)
1702                 ext4_std_error(dir->i_sb, err);
1703         return err;
1704 }
1705
1706 /*
1707  * Get the inline dentry at offset.
1708  */
1709 static inline struct ext4_dir_entry_2 *
1710 ext4_get_inline_entry(struct inode *inode,
1711                       struct ext4_iloc *iloc,
1712                       unsigned int offset,
1713                       void **inline_start,
1714                       int *inline_size)
1715 {
1716         void *inline_pos;
1717
1718         BUG_ON(offset > ext4_get_inline_size(inode));
1719
1720         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1721                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1722                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1723         } else {
1724                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1725                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1726                 *inline_size = ext4_get_inline_size(inode) -
1727                                 EXT4_MIN_INLINE_DATA_SIZE;
1728         }
1729
1730         if (inline_start)
1731                 *inline_start = inline_pos;
1732         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1733 }
1734
1735 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1736 {
1737         int err, inline_size;
1738         struct ext4_iloc iloc;
1739         void *inline_pos;
1740         unsigned int offset;
1741         struct ext4_dir_entry_2 *de;
1742         int ret = 1;
1743
1744         err = ext4_get_inode_loc(dir, &iloc);
1745         if (err) {
1746                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1747                                  err, dir->i_ino);
1748                 return 1;
1749         }
1750
1751         down_read(&EXT4_I(dir)->xattr_sem);
1752         if (!ext4_has_inline_data(dir)) {
1753                 *has_inline_data = 0;
1754                 goto out;
1755         }
1756
1757         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1758         if (!le32_to_cpu(de->inode)) {
1759                 ext4_warning(dir->i_sb,
1760                              "bad inline directory (dir #%lu) - no `..'",
1761                              dir->i_ino);
1762                 ret = 1;
1763                 goto out;
1764         }
1765
1766         offset = EXT4_INLINE_DOTDOT_SIZE;
1767         while (offset < dir->i_size) {
1768                 de = ext4_get_inline_entry(dir, &iloc, offset,
1769                                            &inline_pos, &inline_size);
1770                 if (ext4_check_dir_entry(dir, NULL, de,
1771                                          iloc.bh, inline_pos,
1772                                          inline_size, offset)) {
1773                         ext4_warning(dir->i_sb,
1774                                      "bad inline directory (dir #%lu) - "
1775                                      "inode %u, rec_len %u, name_len %d"
1776                                      "inline size %d\n",
1777                                      dir->i_ino, le32_to_cpu(de->inode),
1778                                      le16_to_cpu(de->rec_len), de->name_len,
1779                                      inline_size);
1780                         ret = 1;
1781                         goto out;
1782                 }
1783                 if (le32_to_cpu(de->inode)) {
1784                         ret = 0;
1785                         goto out;
1786                 }
1787                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1788         }
1789
1790 out:
1791         up_read(&EXT4_I(dir)->xattr_sem);
1792         brelse(iloc.bh);
1793         return ret;
1794 }
1795
1796 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1797 {
1798         int ret;
1799
1800         down_write(&EXT4_I(inode)->xattr_sem);
1801         ret = ext4_destroy_inline_data_nolock(handle, inode);
1802         up_write(&EXT4_I(inode)->xattr_sem);
1803
1804         return ret;
1805 }
1806
1807 int ext4_inline_data_fiemap(struct inode *inode,
1808                             struct fiemap_extent_info *fieinfo,
1809                             int *has_inline)
1810 {
1811         __u64 physical = 0;
1812         __u64 length;
1813         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1814         int error = 0;
1815         struct ext4_iloc iloc;
1816
1817         down_read(&EXT4_I(inode)->xattr_sem);
1818         if (!ext4_has_inline_data(inode)) {
1819                 *has_inline = 0;
1820                 goto out;
1821         }
1822
1823         error = ext4_get_inode_loc(inode, &iloc);
1824         if (error)
1825                 goto out;
1826
1827         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1828         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1829         physical += offsetof(struct ext4_inode, i_block);
1830         length = i_size_read(inode);
1831
1832         if (physical)
1833                 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1834                                                 length, flags);
1835         brelse(iloc.bh);
1836 out:
1837         up_read(&EXT4_I(inode)->xattr_sem);
1838         return (error < 0 ? error : 0);
1839 }
1840
1841 /*
1842  * Called during xattr set, and if we can sparse space 'needed',
1843  * just create the extent tree evict the data to the outer block.
1844  *
1845  * We use jbd2 instead of page cache to move data to the 1st block
1846  * so that the whole transaction can be committed as a whole and
1847  * the data isn't lost because of the delayed page cache write.
1848  */
1849 int ext4_try_to_evict_inline_data(handle_t *handle,
1850                                   struct inode *inode,
1851                                   int needed)
1852 {
1853         int error;
1854         struct ext4_xattr_entry *entry;
1855         struct ext4_inode *raw_inode;
1856         struct ext4_iloc iloc;
1857
1858         error = ext4_get_inode_loc(inode, &iloc);
1859         if (error)
1860                 return error;
1861
1862         raw_inode = ext4_raw_inode(&iloc);
1863         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1864                                             EXT4_I(inode)->i_inline_off);
1865         if (EXT4_XATTR_LEN(entry->e_name_len) +
1866             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1867                 error = -ENOSPC;
1868                 goto out;
1869         }
1870
1871         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1872 out:
1873         brelse(iloc.bh);
1874         return error;
1875 }
1876
1877 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1878 {
1879         handle_t *handle;
1880         int inline_size, value_len, needed_blocks;
1881         size_t i_size;
1882         void *value = NULL;
1883         struct ext4_xattr_ibody_find is = {
1884                 .s = { .not_found = -ENODATA, },
1885         };
1886         struct ext4_xattr_info i = {
1887                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1888                 .name = EXT4_XATTR_SYSTEM_DATA,
1889         };
1890
1891
1892         needed_blocks = ext4_writepage_trans_blocks(inode);
1893         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1894         if (IS_ERR(handle))
1895                 return;
1896
1897         down_write(&EXT4_I(inode)->xattr_sem);
1898         if (!ext4_has_inline_data(inode)) {
1899                 *has_inline = 0;
1900                 ext4_journal_stop(handle);
1901                 return;
1902         }
1903
1904         if (ext4_orphan_add(handle, inode))
1905                 goto out;
1906
1907         if (ext4_get_inode_loc(inode, &is.iloc))
1908                 goto out;
1909
1910         down_write(&EXT4_I(inode)->i_data_sem);
1911         i_size = inode->i_size;
1912         inline_size = ext4_get_inline_size(inode);
1913         EXT4_I(inode)->i_disksize = i_size;
1914
1915         if (i_size < inline_size) {
1916                 /* Clear the content in the xattr space. */
1917                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1918                         if (ext4_xattr_ibody_find(inode, &i, &is))
1919                                 goto out_error;
1920
1921                         BUG_ON(is.s.not_found);
1922
1923                         value_len = le32_to_cpu(is.s.here->e_value_size);
1924                         value = kmalloc(value_len, GFP_NOFS);
1925                         if (!value)
1926                                 goto out_error;
1927
1928                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1929                                                 value, value_len))
1930                                 goto out_error;
1931
1932                         i.value = value;
1933                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1934                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1935                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1936                                 goto out_error;
1937                 }
1938
1939                 /* Clear the content within i_blocks. */
1940                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1941                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1942                         memset(p + i_size, 0,
1943                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1944                 }
1945
1946                 EXT4_I(inode)->i_inline_size = i_size <
1947                                         EXT4_MIN_INLINE_DATA_SIZE ?
1948                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1949         }
1950
1951 out_error:
1952         up_write(&EXT4_I(inode)->i_data_sem);
1953 out:
1954         brelse(is.iloc.bh);
1955         up_write(&EXT4_I(inode)->xattr_sem);
1956         kfree(value);
1957         if (inode->i_nlink)
1958                 ext4_orphan_del(handle, inode);
1959
1960         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1961         ext4_mark_inode_dirty(handle, inode);
1962         if (IS_SYNC(inode))
1963                 ext4_handle_sync(handle);
1964
1965         ext4_journal_stop(handle);
1966         return;
1967 }
1968
1969 int ext4_convert_inline_data(struct inode *inode)
1970 {
1971         int error, needed_blocks;
1972         handle_t *handle;
1973         struct ext4_iloc iloc;
1974
1975         if (!ext4_has_inline_data(inode)) {
1976                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1977                 return 0;
1978         }
1979
1980         needed_blocks = ext4_writepage_trans_blocks(inode);
1981
1982         iloc.bh = NULL;
1983         error = ext4_get_inode_loc(inode, &iloc);
1984         if (error)
1985                 return error;
1986
1987         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1988         if (IS_ERR(handle)) {
1989                 error = PTR_ERR(handle);
1990                 goto out_free;
1991         }
1992
1993         down_write(&EXT4_I(inode)->xattr_sem);
1994         if (!ext4_has_inline_data(inode)) {
1995                 up_write(&EXT4_I(inode)->xattr_sem);
1996                 goto out;
1997         }
1998
1999         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2000         up_write(&EXT4_I(inode)->xattr_sem);
2001 out:
2002         ext4_journal_stop(handle);
2003 out_free:
2004         brelse(iloc.bh);
2005         return error;
2006 }