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                 ext4_truncate_failed_write(inode);
 815                 goto out;
 816         }
 817
 818         SetPageDirty(page);
 819         SetPageUptodate(page);
 820         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 821         *fsdata = (void *)CONVERT_INLINE_DATA;
 822
 823 out:
 824         up_read(&EXT4_I(inode)->xattr_sem);
 825         if (page) {
 826                 unlock_page(page);
 827                 page_cache_release(page);
 828         }
 829         return ret;
 830 }
 831
 832 /*
 833  * Prepare the write for the inline data.
 834  * If the the data can be written into the inode, we just read
 835  * the page and make it uptodate, and start the journal.
 836  * Otherwise read the page, makes it dirty so that it can be
 837  * handle in writepages(the i_disksize update is left to the
 838  * normal ext4_da_write_end).
 839  */
 840 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 841                                     struct inode *inode,
 842                                     loff_t pos, unsigned len,
 843                                     unsigned flags,
 844                                     struct page **pagep,
 845                                     void **fsdata)
 846 {
 847         int ret, inline_size;
 848         handle_t *handle;
 849         struct page *page;
 850         struct ext4_iloc iloc;
 851         int retries;
 852
 853         ret = ext4_get_inode_loc(inode, &iloc);
 854         if (ret)
 855                 return ret;
 856
 857 retry_journal:
 858         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 859         if (IS_ERR(handle)) {
 860                 ret = PTR_ERR(handle);
 861                 goto out;
 862         }
 863
 864         inline_size = ext4_get_max_inline_size(inode);
 865
 866         ret = -ENOSPC;
 867         if (inline_size >= pos + len) {
 868                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 869                 if (ret && ret != -ENOSPC)
 870                         goto out_journal;
 871         }
 872
 873         if (ret == -ENOSPC) {
 874                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 875                                                             inode,
 876                                                             flags,
 877                                                             fsdata);
 878                 ext4_journal_stop(handle);
 879                 if (ret == -ENOSPC &&
 880                     ext4_should_retry_alloc(inode->i_sb, &retries))
 881                         goto retry_journal;
 882                 goto out;
 883         }
 884
 885         /*
 886          * We cannot recurse into the filesystem as the transaction
 887          * is already started.
 888          */
 889         flags |= AOP_FLAG_NOFS;
 890
 891         page = grab_cache_page_write_begin(mapping, 0, flags);
 892         if (!page) {
 893                 ret = -ENOMEM;
 894                 goto out_journal;
 895         }
 896
 897         down_read(&EXT4_I(inode)->xattr_sem);
 898         if (!ext4_has_inline_data(inode)) {
 899                 ret = 0;
 900                 goto out_release_page;
 901         }
 902
 903         if (!PageUptodate(page)) {
 904                 ret = ext4_read_inline_page(inode, page);
 905                 if (ret < 0)
 906                         goto out_release_page;
 907         }
 908
 909         up_read(&EXT4_I(inode)->xattr_sem);
 910         *pagep = page;
 911         brelse(iloc.bh);
 912         return 1;
 913 out_release_page:
 914         up_read(&EXT4_I(inode)->xattr_sem);
 915         unlock_page(page);
 916         page_cache_release(page);
 917 out_journal:
 918         ext4_journal_stop(handle);
 919 out:
 920         brelse(iloc.bh);
 921         return ret;
 922 }
 923
 924 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 925                                   unsigned len, unsigned copied,
 926                                   struct page *page)
 927 {
 928         int i_size_changed = 0;
 929
 930         copied = ext4_write_inline_data_end(inode, pos, len, copied, page);
 931
 932         /*
 933          * No need to use i_size_read() here, the i_size
 934          * cannot change under us because we hold i_mutex.
 935          *
 936          * But it's important to update i_size while still holding page lock:
 937          * page writeout could otherwise come in and zero beyond i_size.
 938          */
 939         if (pos+copied > inode->i_size) {
 940                 i_size_write(inode, pos+copied);
 941                 i_size_changed = 1;
 942         }
 943         unlock_page(page);
 944         page_cache_release(page);
 945
 946         /*
 947          * Don't mark the inode dirty under page lock. First, it unnecessarily
 948          * makes the holding time of page lock longer. Second, it forces lock
 949          * ordering of page lock and transaction start for journaling
 950          * filesystems.
 951          */
 952         if (i_size_changed)
 953                 mark_inode_dirty(inode);
 954
 955         return copied;
 956 }
 957
 958 #ifdef INLINE_DIR_DEBUG
 959 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 960                           void *inline_start, int inline_size)
 961 {
 962         int offset;
 963         unsigned short de_len;
 964         struct ext4_dir_entry_2 *de = inline_start;
 965         void *dlimit = inline_start + inline_size;
 966
 967         trace_printk("inode %lu\n", dir->i_ino);
 968         offset = 0;
 969         while ((void *)de < dlimit) {
 970                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 971                 trace_printk("de: off %u rlen %u name %*.s nlen %u ino %u\n",
 972                              offset, de_len, de->name_len, de->name,
 973                              de->name_len, le32_to_cpu(de->inode));
 974                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 975                                          inline_start, inline_size, offset))
 976                         BUG();
 977
 978                 offset += de_len;
 979                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 980         }
 981 }
 982 #else
 983 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
 984 #endif
 985
 986 /*
 987  * Add a new entry into a inline dir.
 988  * It will return -ENOSPC if no space is available, and -EIO
 989  * and -EEXIST if directory entry already exists.
 990  */
 991 static int ext4_add_dirent_to_inline(handle_t *handle,
 992                                      struct dentry *dentry,
 993                                      struct inode *inode,
 994                                      struct ext4_iloc *iloc,
 995                                      void *inline_start, int inline_size)
 996 {
 997         struct inode    *dir = dentry->d_parent->d_inode;
 998         const char      *name = dentry->d_name.name;
 999         int             namelen = dentry->d_name.len;
1000         int             err;
1001         struct ext4_dir_entry_2 *de;
1002
1003         err = ext4_find_dest_de(dir, inode, iloc->bh,
1004                                 inline_start, inline_size,
1005                                 name, namelen, &de);
1006         if (err)
1007                 return err;
1008
1009         BUFFER_TRACE(iloc->bh, "get_write_access");
1010         err = ext4_journal_get_write_access(handle, iloc->bh);
1011         if (err)
1012                 return err;
1013         ext4_insert_dentry(inode, de, inline_size, name, namelen);
1014
1015         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1016
1017         /*
1018          * XXX shouldn't update any times until successful
1019          * completion of syscall, but too many callers depend
1020          * on this.
1021          *
1022          * XXX similarly, too many callers depend on
1023          * ext4_new_inode() setting the times, but error
1024          * recovery deletes the inode, so the worst that can
1025          * happen is that the times are slightly out of date
1026          * and/or different from the directory change time.
1027          */
1028         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1029         ext4_update_dx_flag(dir);
1030         dir->i_version++;
1031         ext4_mark_inode_dirty(handle, dir);
1032         return 1;
1033 }
1034
1035 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1036                                        struct ext4_iloc *iloc)
1037 {
1038         struct ext4_xattr_entry *entry;
1039         struct ext4_xattr_ibody_header *header;
1040
1041         BUG_ON(!EXT4_I(inode)->i_inline_off);
1042
1043         header = IHDR(inode, ext4_raw_inode(iloc));
1044         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1045                                             EXT4_I(inode)->i_inline_off);
1046
1047         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1048 }
1049
1050 /* Set the final de to cover the whole block. */
1051 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1052 {
1053         struct ext4_dir_entry_2 *de, *prev_de;
1054         void *limit;
1055         int de_len;
1056
1057         de = (struct ext4_dir_entry_2 *)de_buf;
1058         if (old_size) {
1059                 limit = de_buf + old_size;
1060                 do {
1061                         prev_de = de;
1062                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1063                         de_buf += de_len;
1064                         de = (struct ext4_dir_entry_2 *)de_buf;
1065                 } while (de_buf < limit);
1066
1067                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1068                                                         old_size, new_size);
1069         } else {
1070                 /* this is just created, so create an empty entry. */
1071                 de->inode = 0;
1072                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1073         }
1074 }
1075
1076 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1077                                   struct ext4_iloc *iloc)
1078 {
1079         int ret;
1080         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1081         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1082
1083         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1084                 return -ENOSPC;
1085
1086         ret = ext4_update_inline_data(handle, dir,
1087                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1088         if (ret)
1089                 return ret;
1090
1091         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1092                              EXT4_I(dir)->i_inline_size -
1093                                                 EXT4_MIN_INLINE_DATA_SIZE);
1094         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1095         return 0;
1096 }
1097
1098 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1099                                      struct ext4_iloc *iloc,
1100                                      void *buf, int inline_size)
1101 {
1102         ext4_create_inline_data(handle, inode, inline_size);
1103         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1104         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1105 }
1106
1107 static int ext4_finish_convert_inline_dir(handle_t *handle,
1108                                           struct inode *inode,
1109                                           struct buffer_head *dir_block,
1110                                           void *buf,
1111                                           int inline_size)
1112 {
1113         int err, csum_size = 0, header_size = 0;
1114         struct ext4_dir_entry_2 *de;
1115         struct ext4_dir_entry_tail *t;
1116         void *target = dir_block->b_data;
1117
1118         /*
1119          * First create "." and ".." and then copy the dir information
1120          * back to the block.
1121          */
1122         de = (struct ext4_dir_entry_2 *)target;
1123         de = ext4_init_dot_dotdot(inode, de,
1124                 inode->i_sb->s_blocksize, csum_size,
1125                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1126         header_size = (void *)de - target;
1127
1128         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1129                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1130
1131         if (ext4_has_metadata_csum(inode->i_sb))
1132                 csum_size = sizeof(struct ext4_dir_entry_tail);
1133
1134         inode->i_size = inode->i_sb->s_blocksize;
1135         i_size_write(inode, inode->i_sb->s_blocksize);
1136         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1137         ext4_update_final_de(dir_block->b_data,
1138                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1139                         inode->i_sb->s_blocksize - csum_size);
1140
1141         if (csum_size) {
1142                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1143                                      inode->i_sb->s_blocksize);
1144                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1145         }
1146         set_buffer_uptodate(dir_block);
1147         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1148         if (err)
1149                 goto out;
1150         set_buffer_verified(dir_block);
1151 out:
1152         return err;
1153 }
1154
1155 static int ext4_convert_inline_data_nolock(handle_t *handle,
1156                                            struct inode *inode,
1157                                            struct ext4_iloc *iloc)
1158 {
1159         int error;
1160         void *buf = NULL;
1161         struct buffer_head *data_bh = NULL;
1162         struct ext4_map_blocks map;
1163         int inline_size;
1164
1165         inline_size = ext4_get_inline_size(inode);
1166         buf = kmalloc(inline_size, GFP_NOFS);
1167         if (!buf) {
1168                 error = -ENOMEM;
1169                 goto out;
1170         }
1171
1172         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1173         if (error < 0)
1174                 goto out;
1175
1176         /*
1177          * Make sure the inline directory entries pass checks before we try to
1178          * convert them, so that we avoid touching stuff that needs fsck.
1179          */
1180         if (S_ISDIR(inode->i_mode)) {
1181                 error = ext4_check_all_de(inode, iloc->bh,
1182                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1183                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1184                 if (error)
1185                         goto out;
1186         }
1187
1188         error = ext4_destroy_inline_data_nolock(handle, inode);
1189         if (error)
1190                 goto out;
1191
1192         map.m_lblk = 0;
1193         map.m_len = 1;
1194         map.m_flags = 0;
1195         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1196         if (error < 0)
1197                 goto out_restore;
1198         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1199                 error = -EIO;
1200                 goto out_restore;
1201         }
1202
1203         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1204         if (!data_bh) {
1205                 error = -ENOMEM;
1206                 goto out_restore;
1207         }
1208
1209         lock_buffer(data_bh);
1210         error = ext4_journal_get_create_access(handle, data_bh);
1211         if (error) {
1212                 unlock_buffer(data_bh);
1213                 error = -EIO;
1214                 goto out_restore;
1215         }
1216         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1217
1218         if (!S_ISDIR(inode->i_mode)) {
1219                 memcpy(data_bh->b_data, buf, inline_size);
1220                 set_buffer_uptodate(data_bh);
1221                 error = ext4_handle_dirty_metadata(handle,
1222                                                    inode, data_bh);
1223         } else {
1224                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1225                                                        buf, inline_size);
1226         }
1227
1228         unlock_buffer(data_bh);
1229 out_restore:
1230         if (error)
1231                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1232
1233 out:
1234         brelse(data_bh);
1235         kfree(buf);
1236         return error;
1237 }
1238
1239 /*
1240  * Try to add the new entry to the inline data.
1241  * If succeeds, return 0. If not, extended the inline dir and copied data to
1242  * the new created block.
1243  */
1244 int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
1245                               struct inode *inode)
1246 {
1247         int ret, inline_size;
1248         void *inline_start;
1249         struct ext4_iloc iloc;
1250         struct inode *dir = dentry->d_parent->d_inode;
1251
1252         ret = ext4_get_inode_loc(dir, &iloc);
1253         if (ret)
1254                 return ret;
1255
1256         down_write(&EXT4_I(dir)->xattr_sem);
1257         if (!ext4_has_inline_data(dir))
1258                 goto out;
1259
1260         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1261                                                  EXT4_INLINE_DOTDOT_SIZE;
1262         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1263
1264         ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1265                                         inline_start, inline_size);
1266         if (ret != -ENOSPC)
1267                 goto out;
1268
1269         /* check whether it can be inserted to inline xattr space. */
1270         inline_size = EXT4_I(dir)->i_inline_size -
1271                         EXT4_MIN_INLINE_DATA_SIZE;
1272         if (!inline_size) {
1273                 /* Try to use the xattr space.*/
1274                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1275                 if (ret && ret != -ENOSPC)
1276                         goto out;
1277
1278                 inline_size = EXT4_I(dir)->i_inline_size -
1279                                 EXT4_MIN_INLINE_DATA_SIZE;
1280         }
1281
1282         if (inline_size) {
1283                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1284
1285                 ret = ext4_add_dirent_to_inline(handle, dentry, inode, &iloc,
1286                                                 inline_start, inline_size);
1287
1288                 if (ret != -ENOSPC)
1289                         goto out;
1290         }
1291
1292         /*
1293          * The inline space is filled up, so create a new block for it.
1294          * As the extent tree will be created, we have to save the inline
1295          * dir first.
1296          */
1297         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1298
1299 out:
1300         ext4_mark_inode_dirty(handle, dir);
1301         up_write(&EXT4_I(dir)->xattr_sem);
1302         brelse(iloc.bh);
1303         return ret;
1304 }
1305
1306 /*
1307  * This function fills a red-black tree with information from an
1308  * inlined dir.  It returns the number directory entries loaded
1309  * into the tree.  If there is an error it is returned in err.
1310  */
1311 int htree_inlinedir_to_tree(struct file *dir_file,
1312                             struct inode *dir, ext4_lblk_t block,
1313                             struct dx_hash_info *hinfo,
1314                             __u32 start_hash, __u32 start_minor_hash,
1315                             int *has_inline_data)
1316 {
1317         int err = 0, count = 0;
1318         unsigned int parent_ino;
1319         int pos;
1320         struct ext4_dir_entry_2 *de;
1321         struct inode *inode = file_inode(dir_file);
1322         int ret, inline_size = 0;
1323         struct ext4_iloc iloc;
1324         void *dir_buf = NULL;
1325         struct ext4_dir_entry_2 fake;
1326
1327         ret = ext4_get_inode_loc(inode, &iloc);
1328         if (ret)
1329                 return ret;
1330
1331         down_read(&EXT4_I(inode)->xattr_sem);
1332         if (!ext4_has_inline_data(inode)) {
1333                 up_read(&EXT4_I(inode)->xattr_sem);
1334                 *has_inline_data = 0;
1335                 goto out;
1336         }
1337
1338         inline_size = ext4_get_inline_size(inode);
1339         dir_buf = kmalloc(inline_size, GFP_NOFS);
1340         if (!dir_buf) {
1341                 ret = -ENOMEM;
1342                 up_read(&EXT4_I(inode)->xattr_sem);
1343                 goto out;
1344         }
1345
1346         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1347         up_read(&EXT4_I(inode)->xattr_sem);
1348         if (ret < 0)
1349                 goto out;
1350
1351         pos = 0;
1352         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1353         while (pos < inline_size) {
1354                 /*
1355                  * As inlined dir doesn't store any information about '.' and
1356                  * only the inode number of '..' is stored, we have to handle
1357                  * them differently.
1358                  */
1359                 if (pos == 0) {
1360                         fake.inode = cpu_to_le32(inode->i_ino);
1361                         fake.name_len = 1;
1362                         strcpy(fake.name, ".");
1363                         fake.rec_len = ext4_rec_len_to_disk(
1364                                                 EXT4_DIR_REC_LEN(fake.name_len),
1365                                                 inline_size);
1366                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1367                         de = &fake;
1368                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1369                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1370                         fake.inode = cpu_to_le32(parent_ino);
1371                         fake.name_len = 2;
1372                         strcpy(fake.name, "..");
1373                         fake.rec_len = ext4_rec_len_to_disk(
1374                                                 EXT4_DIR_REC_LEN(fake.name_len),
1375                                                 inline_size);
1376                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1377                         de = &fake;
1378                         pos = EXT4_INLINE_DOTDOT_SIZE;
1379                 } else {
1380                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1381                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1382                         if (ext4_check_dir_entry(inode, dir_file, de,
1383                                          iloc.bh, dir_buf,
1384                                          inline_size, pos)) {
1385                                 ret = count;
1386                                 goto out;
1387                         }
1388                 }
1389
1390                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1391                 if ((hinfo->hash < start_hash) ||
1392                     ((hinfo->hash == start_hash) &&
1393                      (hinfo->minor_hash < start_minor_hash)))
1394                         continue;
1395                 if (de->inode == 0)
1396                         continue;
1397                 err = ext4_htree_store_dirent(dir_file,
1398                                    hinfo->hash, hinfo->minor_hash, de);
1399                 if (err) {
1400                         count = err;
1401                         goto out;
1402                 }
1403                 count++;
1404         }
1405         ret = count;
1406 out:
1407         kfree(dir_buf);
1408         brelse(iloc.bh);
1409         return ret;
1410 }
1411
1412 /*
1413  * So this function is called when the volume is mkfsed with
1414  * dir_index disabled. In order to keep f_pos persistent
1415  * after we convert from an inlined dir to a blocked based,
1416  * we just pretend that we are a normal dir and return the
1417  * offset as if '.' and '..' really take place.
1418  *
1419  */
1420 int ext4_read_inline_dir(struct file *file,
1421                          struct dir_context *ctx,
1422                          int *has_inline_data)
1423 {
1424         unsigned int offset, parent_ino;
1425         int i;
1426         struct ext4_dir_entry_2 *de;
1427         struct super_block *sb;
1428         struct inode *inode = file_inode(file);
1429         int ret, inline_size = 0;
1430         struct ext4_iloc iloc;
1431         void *dir_buf = NULL;
1432         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1433
1434         ret = ext4_get_inode_loc(inode, &iloc);
1435         if (ret)
1436                 return ret;
1437
1438         down_read(&EXT4_I(inode)->xattr_sem);
1439         if (!ext4_has_inline_data(inode)) {
1440                 up_read(&EXT4_I(inode)->xattr_sem);
1441                 *has_inline_data = 0;
1442                 goto out;
1443         }
1444
1445         inline_size = ext4_get_inline_size(inode);
1446         dir_buf = kmalloc(inline_size, GFP_NOFS);
1447         if (!dir_buf) {
1448                 ret = -ENOMEM;
1449                 up_read(&EXT4_I(inode)->xattr_sem);
1450                 goto out;
1451         }
1452
1453         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1454         up_read(&EXT4_I(inode)->xattr_sem);
1455         if (ret < 0)
1456                 goto out;
1457
1458         ret = 0;
1459         sb = inode->i_sb;
1460         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1461         offset = ctx->pos;
1462
1463         /*
1464          * dotdot_offset and dotdot_size is the real offset and
1465          * size for ".." and "." if the dir is block based while
1466          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1467          * So we will use extra_offset and extra_size to indicate them
1468          * during the inline dir iteration.
1469          */
1470         dotdot_offset = EXT4_DIR_REC_LEN(1);
1471         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1472         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1473         extra_size = extra_offset + inline_size;
1474
1475         /*
1476          * If the version has changed since the last call to
1477          * readdir(2), then we might be pointing to an invalid
1478          * dirent right now.  Scan from the start of the inline
1479          * dir to make sure.
1480          */
1481         if (file->f_version != inode->i_version) {
1482                 for (i = 0; i < extra_size && i < offset;) {
1483                         /*
1484                          * "." is with offset 0 and
1485                          * ".." is dotdot_offset.
1486                          */
1487                         if (!i) {
1488                                 i = dotdot_offset;
1489                                 continue;
1490                         } else if (i == dotdot_offset) {
1491                                 i = dotdot_size;
1492                                 continue;
1493                         }
1494                         /* for other entry, the real offset in
1495                          * the buf has to be tuned accordingly.
1496                          */
1497                         de = (struct ext4_dir_entry_2 *)
1498                                 (dir_buf + i - extra_offset);
1499                         /* It's too expensive to do a full
1500                          * dirent test each time round this
1501                          * loop, but we do have to test at
1502                          * least that it is non-zero.  A
1503                          * failure will be detected in the
1504                          * dirent test below. */
1505                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1506                                 < EXT4_DIR_REC_LEN(1))
1507                                 break;
1508                         i += ext4_rec_len_from_disk(de->rec_len,
1509                                                     extra_size);
1510                 }
1511                 offset = i;
1512                 ctx->pos = offset;
1513                 file->f_version = inode->i_version;
1514         }
1515
1516         while (ctx->pos < extra_size) {
1517                 if (ctx->pos == 0) {
1518                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1519                                 goto out;
1520                         ctx->pos = dotdot_offset;
1521                         continue;
1522                 }
1523
1524                 if (ctx->pos == dotdot_offset) {
1525                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1526                                 goto out;
1527                         ctx->pos = dotdot_size;
1528                         continue;
1529                 }
1530
1531                 de = (struct ext4_dir_entry_2 *)
1532                         (dir_buf + ctx->pos - extra_offset);
1533                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1534                                          extra_size, ctx->pos))
1535                         goto out;
1536                 if (le32_to_cpu(de->inode)) {
1537                         if (!dir_emit(ctx, de->name, de->name_len,
1538                                       le32_to_cpu(de->inode),
1539                                       get_dtype(sb, de->file_type)))
1540                                 goto out;
1541                 }
1542                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1543         }
1544 out:
1545         kfree(dir_buf);
1546         brelse(iloc.bh);
1547         return ret;
1548 }
1549
1550 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1551                                         struct ext4_dir_entry_2 **parent_de,
1552                                         int *retval)
1553 {
1554         struct ext4_iloc iloc;
1555
1556         *retval = ext4_get_inode_loc(inode, &iloc);
1557         if (*retval)
1558                 return NULL;
1559
1560         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1561
1562         return iloc.bh;
1563 }
1564
1565 /*
1566  * Try to create the inline data for the new dir.
1567  * If it succeeds, return 0, otherwise return the error.
1568  * In case of ENOSPC, the caller should create the normal disk layout dir.
1569  */
1570 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1571                                struct inode *inode)
1572 {
1573         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1574         struct ext4_iloc iloc;
1575         struct ext4_dir_entry_2 *de;
1576
1577         ret = ext4_get_inode_loc(inode, &iloc);
1578         if (ret)
1579                 return ret;
1580
1581         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1582         if (ret)
1583                 goto out;
1584
1585         /*
1586          * For inline dir, we only save the inode information for the ".."
1587          * and create a fake dentry to cover the left space.
1588          */
1589         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1590         de->inode = cpu_to_le32(parent->i_ino);
1591         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1592         de->inode = 0;
1593         de->rec_len = ext4_rec_len_to_disk(
1594                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1595                                 inline_size);
1596         set_nlink(inode, 2);
1597         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1598 out:
1599         brelse(iloc.bh);
1600         return ret;
1601 }
1602
1603 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1604                                         const struct qstr *d_name,
1605                                         struct ext4_dir_entry_2 **res_dir,
1606                                         int *has_inline_data)
1607 {
1608         int ret;
1609         struct ext4_iloc iloc;
1610         void *inline_start;
1611         int inline_size;
1612
1613         if (ext4_get_inode_loc(dir, &iloc))
1614                 return NULL;
1615
1616         down_read(&EXT4_I(dir)->xattr_sem);
1617         if (!ext4_has_inline_data(dir)) {
1618                 *has_inline_data = 0;
1619                 goto out;
1620         }
1621
1622         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1623                                                 EXT4_INLINE_DOTDOT_SIZE;
1624         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1625         ret = search_dir(iloc.bh, inline_start, inline_size,
1626                          dir, d_name, 0, res_dir);
1627         if (ret == 1)
1628                 goto out_find;
1629         if (ret < 0)
1630                 goto out;
1631
1632         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1633                 goto out;
1634
1635         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1636         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1637
1638         ret = search_dir(iloc.bh, inline_start, inline_size,
1639                          dir, d_name, 0, res_dir);
1640         if (ret == 1)
1641                 goto out_find;
1642
1643 out:
1644         brelse(iloc.bh);
1645         iloc.bh = NULL;
1646 out_find:
1647         up_read(&EXT4_I(dir)->xattr_sem);
1648         return iloc.bh;
1649 }
1650
1651 int ext4_delete_inline_entry(handle_t *handle,
1652                              struct inode *dir,
1653                              struct ext4_dir_entry_2 *de_del,
1654                              struct buffer_head *bh,
1655                              int *has_inline_data)
1656 {
1657         int err, inline_size;
1658         struct ext4_iloc iloc;
1659         void *inline_start;
1660
1661         err = ext4_get_inode_loc(dir, &iloc);
1662         if (err)
1663                 return err;
1664
1665         down_write(&EXT4_I(dir)->xattr_sem);
1666         if (!ext4_has_inline_data(dir)) {
1667                 *has_inline_data = 0;
1668                 goto out;
1669         }
1670
1671         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1672                 EXT4_MIN_INLINE_DATA_SIZE) {
1673                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1674                                         EXT4_INLINE_DOTDOT_SIZE;
1675                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1676                                 EXT4_INLINE_DOTDOT_SIZE;
1677         } else {
1678                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1679                 inline_size = ext4_get_inline_size(dir) -
1680                                 EXT4_MIN_INLINE_DATA_SIZE;
1681         }
1682
1683         BUFFER_TRACE(bh, "get_write_access");
1684         err = ext4_journal_get_write_access(handle, bh);
1685         if (err)
1686                 goto out;
1687
1688         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1689                                         inline_start, inline_size, 0);
1690         if (err)
1691                 goto out;
1692
1693         BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
1694         err = ext4_mark_inode_dirty(handle, dir);
1695         if (unlikely(err))
1696                 goto out;
1697
1698         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1699 out:
1700         up_write(&EXT4_I(dir)->xattr_sem);
1701         brelse(iloc.bh);
1702         if (err != -ENOENT)
1703                 ext4_std_error(dir->i_sb, err);
1704         return err;
1705 }
1706
1707 /*
1708  * Get the inline dentry at offset.
1709  */
1710 static inline struct ext4_dir_entry_2 *
1711 ext4_get_inline_entry(struct inode *inode,
1712                       struct ext4_iloc *iloc,
1713                       unsigned int offset,
1714                       void **inline_start,
1715                       int *inline_size)
1716 {
1717         void *inline_pos;
1718
1719         BUG_ON(offset > ext4_get_inline_size(inode));
1720
1721         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1722                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1723                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1724         } else {
1725                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1726                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1727                 *inline_size = ext4_get_inline_size(inode) -
1728                                 EXT4_MIN_INLINE_DATA_SIZE;
1729         }
1730
1731         if (inline_start)
1732                 *inline_start = inline_pos;
1733         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1734 }
1735
1736 int empty_inline_dir(struct inode *dir, int *has_inline_data)
1737 {
1738         int err, inline_size;
1739         struct ext4_iloc iloc;
1740         void *inline_pos;
1741         unsigned int offset;
1742         struct ext4_dir_entry_2 *de;
1743         int ret = 1;
1744
1745         err = ext4_get_inode_loc(dir, &iloc);
1746         if (err) {
1747                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1748                                  err, dir->i_ino);
1749                 return 1;
1750         }
1751
1752         down_read(&EXT4_I(dir)->xattr_sem);
1753         if (!ext4_has_inline_data(dir)) {
1754                 *has_inline_data = 0;
1755                 goto out;
1756         }
1757
1758         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1759         if (!le32_to_cpu(de->inode)) {
1760                 ext4_warning(dir->i_sb,
1761                              "bad inline directory (dir #%lu) - no `..'",
1762                              dir->i_ino);
1763                 ret = 1;
1764                 goto out;
1765         }
1766
1767         offset = EXT4_INLINE_DOTDOT_SIZE;
1768         while (offset < dir->i_size) {
1769                 de = ext4_get_inline_entry(dir, &iloc, offset,
1770                                            &inline_pos, &inline_size);
1771                 if (ext4_check_dir_entry(dir, NULL, de,
1772                                          iloc.bh, inline_pos,
1773                                          inline_size, offset)) {
1774                         ext4_warning(dir->i_sb,
1775                                      "bad inline directory (dir #%lu) - "
1776                                      "inode %u, rec_len %u, name_len %d"
1777                                      "inline size %d\n",
1778                                      dir->i_ino, le32_to_cpu(de->inode),
1779                                      le16_to_cpu(de->rec_len), de->name_len,
1780                                      inline_size);
1781                         ret = 1;
1782                         goto out;
1783                 }
1784                 if (le32_to_cpu(de->inode)) {
1785                         ret = 0;
1786                         goto out;
1787                 }
1788                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1789         }
1790
1791 out:
1792         up_read(&EXT4_I(dir)->xattr_sem);
1793         brelse(iloc.bh);
1794         return ret;
1795 }
1796
1797 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1798 {
1799         int ret;
1800
1801         down_write(&EXT4_I(inode)->xattr_sem);
1802         ret = ext4_destroy_inline_data_nolock(handle, inode);
1803         up_write(&EXT4_I(inode)->xattr_sem);
1804
1805         return ret;
1806 }
1807
1808 int ext4_inline_data_fiemap(struct inode *inode,
1809                             struct fiemap_extent_info *fieinfo,
1810                             int *has_inline)
1811 {
1812         __u64 physical = 0;
1813         __u64 length;
1814         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST;
1815         int error = 0;
1816         struct ext4_iloc iloc;
1817
1818         down_read(&EXT4_I(inode)->xattr_sem);
1819         if (!ext4_has_inline_data(inode)) {
1820                 *has_inline = 0;
1821                 goto out;
1822         }
1823
1824         error = ext4_get_inode_loc(inode, &iloc);
1825         if (error)
1826                 goto out;
1827
1828         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1829         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1830         physical += offsetof(struct ext4_inode, i_block);
1831         length = i_size_read(inode);
1832
1833         if (physical)
1834                 error = fiemap_fill_next_extent(fieinfo, 0, physical,
1835                                                 length, flags);
1836         brelse(iloc.bh);
1837 out:
1838         up_read(&EXT4_I(inode)->xattr_sem);
1839         return (error < 0 ? error : 0);
1840 }
1841
1842 /*
1843  * Called during xattr set, and if we can sparse space 'needed',
1844  * just create the extent tree evict the data to the outer block.
1845  *
1846  * We use jbd2 instead of page cache to move data to the 1st block
1847  * so that the whole transaction can be committed as a whole and
1848  * the data isn't lost because of the delayed page cache write.
1849  */
1850 int ext4_try_to_evict_inline_data(handle_t *handle,
1851                                   struct inode *inode,
1852                                   int needed)
1853 {
1854         int error;
1855         struct ext4_xattr_entry *entry;
1856         struct ext4_inode *raw_inode;
1857         struct ext4_iloc iloc;
1858
1859         error = ext4_get_inode_loc(inode, &iloc);
1860         if (error)
1861                 return error;
1862
1863         raw_inode = ext4_raw_inode(&iloc);
1864         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1865                                             EXT4_I(inode)->i_inline_off);
1866         if (EXT4_XATTR_LEN(entry->e_name_len) +
1867             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1868                 error = -ENOSPC;
1869                 goto out;
1870         }
1871
1872         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1873 out:
1874         brelse(iloc.bh);
1875         return error;
1876 }
1877
1878 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1879 {
1880         handle_t *handle;
1881         int inline_size, value_len, needed_blocks;
1882         size_t i_size;
1883         void *value = NULL;
1884         struct ext4_xattr_ibody_find is = {
1885                 .s = { .not_found = -ENODATA, },
1886         };
1887         struct ext4_xattr_info i = {
1888                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1889                 .name = EXT4_XATTR_SYSTEM_DATA,
1890         };
1891
1892
1893         needed_blocks = ext4_writepage_trans_blocks(inode);
1894         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1895         if (IS_ERR(handle))
1896                 return;
1897
1898         down_write(&EXT4_I(inode)->xattr_sem);
1899         if (!ext4_has_inline_data(inode)) {
1900                 *has_inline = 0;
1901                 ext4_journal_stop(handle);
1902                 return;
1903         }
1904
1905         if (ext4_orphan_add(handle, inode))
1906                 goto out;
1907
1908         if (ext4_get_inode_loc(inode, &is.iloc))
1909                 goto out;
1910
1911         down_write(&EXT4_I(inode)->i_data_sem);
1912         i_size = inode->i_size;
1913         inline_size = ext4_get_inline_size(inode);
1914         EXT4_I(inode)->i_disksize = i_size;
1915
1916         if (i_size < inline_size) {
1917                 /* Clear the content in the xattr space. */
1918                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1919                         if (ext4_xattr_ibody_find(inode, &i, &is))
1920                                 goto out_error;
1921
1922                         BUG_ON(is.s.not_found);
1923
1924                         value_len = le32_to_cpu(is.s.here->e_value_size);
1925                         value = kmalloc(value_len, GFP_NOFS);
1926                         if (!value)
1927                                 goto out_error;
1928
1929                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1930                                                 value, value_len))
1931                                 goto out_error;
1932
1933                         i.value = value;
1934                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1935                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1936                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1937                                 goto out_error;
1938                 }
1939
1940                 /* Clear the content within i_blocks. */
1941                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1942                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1943                         memset(p + i_size, 0,
1944                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1945                 }
1946
1947                 EXT4_I(inode)->i_inline_size = i_size <
1948                                         EXT4_MIN_INLINE_DATA_SIZE ?
1949                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1950         }
1951
1952 out_error:
1953         up_write(&EXT4_I(inode)->i_data_sem);
1954 out:
1955         brelse(is.iloc.bh);
1956         up_write(&EXT4_I(inode)->xattr_sem);
1957         kfree(value);
1958         if (inode->i_nlink)
1959                 ext4_orphan_del(handle, inode);
1960
1961         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
1962         ext4_mark_inode_dirty(handle, inode);
1963         if (IS_SYNC(inode))
1964                 ext4_handle_sync(handle);
1965
1966         ext4_journal_stop(handle);
1967         return;
1968 }
1969
1970 int ext4_convert_inline_data(struct inode *inode)
1971 {
1972         int error, needed_blocks;
1973         handle_t *handle;
1974         struct ext4_iloc iloc;
1975
1976         if (!ext4_has_inline_data(inode)) {
1977                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1978                 return 0;
1979         }
1980
1981         needed_blocks = ext4_writepage_trans_blocks(inode);
1982
1983         iloc.bh = NULL;
1984         error = ext4_get_inode_loc(inode, &iloc);
1985         if (error)
1986                 return error;
1987
1988         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1989         if (IS_ERR(handle)) {
1990                 error = PTR_ERR(handle);
1991                 goto out_free;
1992         }
1993
1994         down_write(&EXT4_I(inode)->xattr_sem);
1995         if (!ext4_has_inline_data(inode)) {
1996                 up_write(&EXT4_I(inode)->xattr_sem);
1997                 goto out;
1998         }
1999
2000         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2001         up_write(&EXT4_I(inode)->xattr_sem);
2002 out:
2003         ext4_journal_stop(handle);
2004 out_free:
2005         brelse(iloc.bh);
2006         return error;
2007 }