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
  15 #include <linux/fiemap.h>
  16
  17 #include "ext4_jbd2.h"
  18 #include "ext4.h"
  19 #include "xattr.h"
  20 #include "truncate.h"
  21 #include <trace/events/android_fs.h>
  22
  23 #define EXT4_XATTR_SYSTEM_DATA  "data"
  24 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  25 #define EXT4_INLINE_DOTDOT_OFFSET       2
  26 #define EXT4_INLINE_DOTDOT_SIZE         4
  27
  28 static int ext4_get_inline_size(struct inode *inode)
  29 {
  30         if (EXT4_I(inode)->i_inline_off)
  31                 return EXT4_I(inode)->i_inline_size;
  32
  33         return 0;
  34 }
  35
  36 static int get_max_inline_xattr_value_size(struct inode *inode,
  37                                            struct ext4_iloc *iloc)
  38 {
  39         struct ext4_xattr_ibody_header *header;
  40         struct ext4_xattr_entry *entry;
  41         struct ext4_inode *raw_inode;
  42         int free, min_offs;
  43
  44         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  45                         EXT4_GOOD_OLD_INODE_SIZE -
  46                         EXT4_I(inode)->i_extra_isize -
  47                         sizeof(struct ext4_xattr_ibody_header);
  48
  49         /*
  50          * We need to subtract another sizeof(__u32) since an in-inode xattr
  51          * needs an empty 4 bytes to indicate the gap between the xattr entry
  52          * and the name/value pair.
  53          */
  54         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  55                 return EXT4_XATTR_SIZE(min_offs -
  56                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  57                         EXT4_XATTR_ROUND - sizeof(__u32));
  58
  59         raw_inode = ext4_raw_inode(iloc);
  60         header = IHDR(inode, raw_inode);
  61         entry = IFIRST(header);
  62
  63         /* Compute min_offs. */
  64         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  65                 if (!entry->e_value_block && entry->e_value_size) {
  66                         size_t offs = le16_to_cpu(entry->e_value_offs);
  67                         if (offs < min_offs)
  68                                 min_offs = offs;
  69                 }
  70         }
  71         free = min_offs -
  72                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  73
  74         if (EXT4_I(inode)->i_inline_off) {
  75                 entry = (struct ext4_xattr_entry *)
  76                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  77
  78                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  79                 goto out;
  80         }
  81
  82         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  83
  84         if (free > EXT4_XATTR_ROUND)
  85                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  86         else
  87                 free = 0;
  88
  89 out:
  90         return free;
  91 }
  92
  93 /*
  94  * Get the maximum size we now can store in an inode.
  95  * If we can't find the space for a xattr entry, don't use the space
  96  * of the extents since we have no space to indicate the inline data.
  97  */
  98 int ext4_get_max_inline_size(struct inode *inode)
  99 {
 100         int error, max_inline_size;
 101         struct ext4_iloc iloc;
 102
 103         if (EXT4_I(inode)->i_extra_isize == 0)
 104                 return 0;
 105
 106         error = ext4_get_inode_loc(inode, &iloc);
 107         if (error) {
 108                 ext4_error_inode(inode, __func__, __LINE__, 0,
 109                                  "can't get inode location %lu",
 110                                  inode->i_ino);
 111                 return 0;
 112         }
 113
 114         down_read(&EXT4_I(inode)->xattr_sem);
 115         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 116         up_read(&EXT4_I(inode)->xattr_sem);
 117
 118         brelse(iloc.bh);
 119
 120         if (!max_inline_size)
 121                 return 0;
 122
 123         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 124 }
 125
 126 /*
 127  * this function does not take xattr_sem, which is OK because it is
 128  * currently only used in a code path coming form ext4_iget, before
 129  * the new inode has been unlocked
 130  */
 131 int ext4_find_inline_data_nolock(struct inode *inode)
 132 {
 133         struct ext4_xattr_ibody_find is = {
 134                 .s = { .not_found = -ENODATA, },
 135         };
 136         struct ext4_xattr_info i = {
 137                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 138                 .name = EXT4_XATTR_SYSTEM_DATA,
 139         };
 140         int error;
 141
 142         if (EXT4_I(inode)->i_extra_isize == 0)
 143                 return 0;
 144
 145         error = ext4_get_inode_loc(inode, &is.iloc);
 146         if (error)
 147                 return error;
 148
 149         error = ext4_xattr_ibody_find(inode, &i, &is);
 150         if (error)
 151                 goto out;
 152
 153         if (!is.s.not_found) {
 154                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 155                                         (void *)ext4_raw_inode(&is.iloc));
 156                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 157                                 le32_to_cpu(is.s.here->e_value_size);
 158                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 159         }
 160 out:
 161         brelse(is.iloc.bh);
 162         return error;
 163 }
 164
 165 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 166                                  unsigned int len,
 167                                  struct ext4_iloc *iloc)
 168 {
 169         struct ext4_xattr_entry *entry;
 170         struct ext4_xattr_ibody_header *header;
 171         int cp_len = 0;
 172         struct ext4_inode *raw_inode;
 173
 174         if (!len)
 175                 return 0;
 176
 177         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 178
 179         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 180                         len : EXT4_MIN_INLINE_DATA_SIZE;
 181
 182         raw_inode = ext4_raw_inode(iloc);
 183         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 184
 185         len -= cp_len;
 186         buffer += cp_len;
 187
 188         if (!len)
 189                 goto out;
 190
 191         header = IHDR(inode, raw_inode);
 192         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 193                                             EXT4_I(inode)->i_inline_off);
 194         len = min_t(unsigned int, len,
 195                     (unsigned int)le32_to_cpu(entry->e_value_size));
 196
 197         memcpy(buffer,
 198                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 199         cp_len += len;
 200
 201 out:
 202         return cp_len;
 203 }
 204
 205 /*
 206  * write the buffer to the inline inode.
 207  * If 'create' is set, we don't need to do the extra copy in the xattr
 208  * value since it is already handled by ext4_xattr_ibody_inline_set.
 209  * That saves us one memcpy.
 210  */
 211 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 212                                    void *buffer, loff_t pos, unsigned int len)
 213 {
 214         struct ext4_xattr_entry *entry;
 215         struct ext4_xattr_ibody_header *header;
 216         struct ext4_inode *raw_inode;
 217         int cp_len = 0;
 218
 219         BUG_ON(!EXT4_I(inode)->i_inline_off);
 220         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 221
 222         raw_inode = ext4_raw_inode(iloc);
 223         buffer += pos;
 224
 225         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 226                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 227                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 228                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 229
 230                 len -= cp_len;
 231                 buffer += cp_len;
 232                 pos += cp_len;
 233         }
 234
 235         if (!len)
 236                 return;
 237
 238         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 239         header = IHDR(inode, raw_inode);
 240         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 241                                             EXT4_I(inode)->i_inline_off);
 242
 243         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 244                buffer, len);
 245 }
 246
 247 static int ext4_create_inline_data(handle_t *handle,
 248                                    struct inode *inode, unsigned len)
 249 {
 250         int error;
 251         void *value = NULL;
 252         struct ext4_xattr_ibody_find is = {
 253                 .s = { .not_found = -ENODATA, },
 254         };
 255         struct ext4_xattr_info i = {
 256                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 257                 .name = EXT4_XATTR_SYSTEM_DATA,
 258         };
 259
 260         error = ext4_get_inode_loc(inode, &is.iloc);
 261         if (error)
 262                 return error;
 263
 264         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 265         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 266         if (error)
 267                 goto out;
 268
 269         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 270                 value = EXT4_ZERO_XATTR_VALUE;
 271                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 272         } else {
 273                 value = "";
 274                 len = 0;
 275         }
 276
 277         /* Insert the the xttr entry. */
 278         i.value = value;
 279         i.value_len = len;
 280
 281         error = ext4_xattr_ibody_find(inode, &i, &is);
 282         if (error)
 283                 goto out;
 284
 285         BUG_ON(!is.s.not_found);
 286
 287         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 288         if (error) {
 289                 if (error == -ENOSPC)
 290                         ext4_clear_inode_state(inode,
 291                                                EXT4_STATE_MAY_INLINE_DATA);
 292                 goto out;
 293         }
 294
 295         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 296                 0, EXT4_MIN_INLINE_DATA_SIZE);
 297
 298         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 299                                       (void *)ext4_raw_inode(&is.iloc));
 300         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 301         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 302         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 303         get_bh(is.iloc.bh);
 304         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 305
 306 out:
 307         brelse(is.iloc.bh);
 308         return error;
 309 }
 310
 311 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 312                                    unsigned int len)
 313 {
 314         int error;
 315         void *value = NULL;
 316         struct ext4_xattr_ibody_find is = {
 317                 .s = { .not_found = -ENODATA, },
 318         };
 319         struct ext4_xattr_info i = {
 320                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 321                 .name = EXT4_XATTR_SYSTEM_DATA,
 322         };
 323
 324         /* If the old space is ok, write the data directly. */
 325         if (len <= EXT4_I(inode)->i_inline_size)
 326                 return 0;
 327
 328         error = ext4_get_inode_loc(inode, &is.iloc);
 329         if (error)
 330                 return error;
 331
 332         error = ext4_xattr_ibody_find(inode, &i, &is);
 333         if (error)
 334                 goto out;
 335
 336         BUG_ON(is.s.not_found);
 337
 338         len -= EXT4_MIN_INLINE_DATA_SIZE;
 339         value = kzalloc(len, GFP_NOFS);
 340         if (!value) {
 341                 error = -ENOMEM;
 342                 goto out;
 343         }
 344
 345         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 346                                      value, len);
 347         if (error == -ENODATA)
 348                 goto out;
 349
 350         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 351         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 352         if (error)
 353                 goto out;
 354
 355         /* Update the xttr entry. */
 356         i.value = value;
 357         i.value_len = len;
 358
 359         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 360         if (error)
 361                 goto out;
 362
 363         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 364                                       (void *)ext4_raw_inode(&is.iloc));
 365         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 366                                 le32_to_cpu(is.s.here->e_value_size);
 367         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 368         get_bh(is.iloc.bh);
 369         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 370
 371 out:
 372         kfree(value);
 373         brelse(is.iloc.bh);
 374         return error;
 375 }
 376
 377 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 378                                     unsigned int len)
 379 {
 380         int ret, size, no_expand;
 381         struct ext4_inode_info *ei = EXT4_I(inode);
 382
 383         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 384                 return -ENOSPC;
 385
 386         size = ext4_get_max_inline_size(inode);
 387         if (size < len)
 388                 return -ENOSPC;
 389
 390         ext4_write_lock_xattr(inode, &no_expand);
 391
 392         if (ei->i_inline_off)
 393                 ret = ext4_update_inline_data(handle, inode, len);
 394         else
 395                 ret = ext4_create_inline_data(handle, inode, len);
 396
 397         ext4_write_unlock_xattr(inode, &no_expand);
 398         return ret;
 399 }
 400
 401 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 402                                            struct inode *inode)
 403 {
 404         struct ext4_inode_info *ei = EXT4_I(inode);
 405         struct ext4_xattr_ibody_find is = {
 406                 .s = { .not_found = 0, },
 407         };
 408         struct ext4_xattr_info i = {
 409                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 410                 .name = EXT4_XATTR_SYSTEM_DATA,
 411                 .value = NULL,
 412                 .value_len = 0,
 413         };
 414         int error;
 415
 416         if (!ei->i_inline_off)
 417                 return 0;
 418
 419         error = ext4_get_inode_loc(inode, &is.iloc);
 420         if (error)
 421                 return error;
 422
 423         error = ext4_xattr_ibody_find(inode, &i, &is);
 424         if (error)
 425                 goto out;
 426
 427         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 428         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 429         if (error)
 430                 goto out;
 431
 432         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 433         if (error)
 434                 goto out;
 435
 436         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 437                 0, EXT4_MIN_INLINE_DATA_SIZE);
 438         memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
 439
 440         if (ext4_has_feature_extents(inode->i_sb)) {
 441                 if (S_ISDIR(inode->i_mode) ||
 442                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 443                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 444                         ext4_ext_tree_init(handle, inode);
 445                 }
 446         }
 447         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 448
 449         get_bh(is.iloc.bh);
 450         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 451
 452         EXT4_I(inode)->i_inline_off = 0;
 453         EXT4_I(inode)->i_inline_size = 0;
 454         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 455 out:
 456         brelse(is.iloc.bh);
 457         if (error == -ENODATA)
 458                 error = 0;
 459         return error;
 460 }
 461
 462 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 463 {
 464         void *kaddr;
 465         int ret = 0;
 466         size_t len;
 467         struct ext4_iloc iloc;
 468
 469         BUG_ON(!PageLocked(page));
 470         BUG_ON(!ext4_has_inline_data(inode));
 471         BUG_ON(page->index);
 472
 473         if (!EXT4_I(inode)->i_inline_off) {
 474                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 475                              inode->i_ino);
 476                 goto out;
 477         }
 478
 479         ret = ext4_get_inode_loc(inode, &iloc);
 480         if (ret)
 481                 goto out;
 482
 483         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 484         kaddr = kmap_atomic(page);
 485         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 486         flush_dcache_page(page);
 487         kunmap_atomic(kaddr);
 488         zero_user_segment(page, len, PAGE_SIZE);
 489         SetPageUptodate(page);
 490         brelse(iloc.bh);
 491
 492 out:
 493         return ret;
 494 }
 495
 496 int ext4_readpage_inline(struct inode *inode, struct page *page)
 497 {
 498         int ret = 0;
 499
 500         down_read(&EXT4_I(inode)->xattr_sem);
 501         if (!ext4_has_inline_data(inode)) {
 502                 up_read(&EXT4_I(inode)->xattr_sem);
 503                 return -EAGAIN;
 504         }
 505
 506         if (trace_android_fs_dataread_start_enabled()) {
 507                 char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];
 508
 509                 path = android_fstrace_get_pathname(pathbuf,
 510                                                     MAX_TRACE_PATHBUF_LEN,
 511                                                     inode);
 512                 trace_android_fs_dataread_start(inode, page_offset(page),
 513                                                 PAGE_SIZE, current->pid,
 514                                                 path, current->comm);
 515         }
 516
 517         /*
 518          * Current inline data can only exist in the 1st page,
 519          * So for all the other pages, just set them uptodate.
 520          */
 521         if (!page->index)
 522                 ret = ext4_read_inline_page(inode, page);
 523         else if (!PageUptodate(page)) {
 524                 zero_user_segment(page, 0, PAGE_SIZE);
 525                 SetPageUptodate(page);
 526         }
 527
 528         trace_android_fs_dataread_end(inode, page_offset(page), PAGE_SIZE);
 529
 530         up_read(&EXT4_I(inode)->xattr_sem);
 531
 532         unlock_page(page);
 533         return ret >= 0 ? 0 : ret;
 534 }
 535
 536 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 537                                               struct inode *inode,
 538                                               unsigned flags)
 539 {
 540         int ret, needed_blocks, no_expand;
 541         handle_t *handle = NULL;
 542         int retries = 0, sem_held = 0;
 543         struct page *page = NULL;
 544         unsigned from, to;
 545         struct ext4_iloc iloc;
 546
 547         if (!ext4_has_inline_data(inode)) {
 548                 /*
 549                  * clear the flag so that no new write
 550                  * will trap here again.
 551                  */
 552                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 553                 return 0;
 554         }
 555
 556         needed_blocks = ext4_writepage_trans_blocks(inode);
 557
 558         ret = ext4_get_inode_loc(inode, &iloc);
 559         if (ret)
 560                 return ret;
 561
 562 retry:
 563         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 564         if (IS_ERR(handle)) {
 565                 ret = PTR_ERR(handle);
 566                 handle = NULL;
 567                 goto out;
 568         }
 569
 570         /* We cannot recurse into the filesystem as the transaction is already
 571          * started */
 572         flags |= AOP_FLAG_NOFS;
 573
 574         page = grab_cache_page_write_begin(mapping, 0, flags);
 575         if (!page) {
 576                 ret = -ENOMEM;
 577                 goto out;
 578         }
 579
 580         ext4_write_lock_xattr(inode, &no_expand);
 581         sem_held = 1;
 582         /* If some one has already done this for us, just exit. */
 583         if (!ext4_has_inline_data(inode)) {
 584                 ret = 0;
 585                 goto out;
 586         }
 587
 588         from = 0;
 589         to = ext4_get_inline_size(inode);
 590         if (!PageUptodate(page)) {
 591                 ret = ext4_read_inline_page(inode, page);
 592                 if (ret < 0)
 593                         goto out;
 594         }
 595
 596         ret = ext4_destroy_inline_data_nolock(handle, inode);
 597         if (ret)
 598                 goto out;
 599
 600         if (ext4_should_dioread_nolock(inode)) {
 601                 ret = __block_write_begin(page, from, to,
 602                                           ext4_get_block_unwritten);
 603         } else
 604                 ret = __block_write_begin(page, from, to, ext4_get_block);
 605
 606         if (!ret && ext4_should_journal_data(inode)) {
 607                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 608                                              from, to, NULL,
 609                                              do_journal_get_write_access);
 610         }
 611
 612         if (ret) {
 613                 unlock_page(page);
 614                 put_page(page);
 615                 page = NULL;
 616                 ext4_orphan_add(handle, inode);
 617                 ext4_write_unlock_xattr(inode, &no_expand);
 618                 sem_held = 0;
 619                 ext4_journal_stop(handle);
 620                 handle = NULL;
 621                 ext4_truncate_failed_write(inode);
 622                 /*
 623                  * If truncate failed early the inode might
 624                  * still be on the orphan list; we need to
 625                  * make sure the inode is removed from the
 626                  * orphan list in that case.
 627                  */
 628                 if (inode->i_nlink)
 629                         ext4_orphan_del(NULL, inode);
 630         }
 631
 632         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 633                 goto retry;
 634
 635         if (page)
 636                 block_commit_write(page, from, to);
 637 out:
 638         if (page) {
 639                 unlock_page(page);
 640                 put_page(page);
 641         }
 642         if (sem_held)
 643                 ext4_write_unlock_xattr(inode, &no_expand);
 644         if (handle)
 645                 ext4_journal_stop(handle);
 646         brelse(iloc.bh);
 647         return ret;
 648 }
 649
 650 /*
 651  * Try to write data in the inode.
 652  * If the inode has inline data, check whether the new write can be
 653  * in the inode also. If not, create the page the handle, move the data
 654  * to the page make it update and let the later codes create extent for it.
 655  */
 656 int ext4_try_to_write_inline_data(struct address_space *mapping,
 657                                   struct inode *inode,
 658                                   loff_t pos, unsigned len,
 659                                   unsigned flags,
 660                                   struct page **pagep)
 661 {
 662         int ret;
 663         handle_t *handle;
 664         struct page *page;
 665         struct ext4_iloc iloc;
 666
 667         if (pos + len > ext4_get_max_inline_size(inode))
 668                 goto convert;
 669
 670         ret = ext4_get_inode_loc(inode, &iloc);
 671         if (ret)
 672                 return ret;
 673
 674         /*
 675          * The possible write could happen in the inode,
 676          * so try to reserve the space in inode first.
 677          */
 678         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 679         if (IS_ERR(handle)) {
 680                 ret = PTR_ERR(handle);
 681                 handle = NULL;
 682                 goto out;
 683         }
 684
 685         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 686         if (ret && ret != -ENOSPC)
 687                 goto out;
 688
 689         /* We don't have space in inline inode, so convert it to extent. */
 690         if (ret == -ENOSPC) {
 691                 ext4_journal_stop(handle);
 692                 brelse(iloc.bh);
 693                 goto convert;
 694         }
 695
 696         ret = ext4_journal_get_write_access(handle, iloc.bh);
 697         if (ret)
 698                 goto out;
 699
 700         flags |= AOP_FLAG_NOFS;
 701
 702         page = grab_cache_page_write_begin(mapping, 0, flags);
 703         if (!page) {
 704                 ret = -ENOMEM;
 705                 goto out;
 706         }
 707
 708         *pagep = page;
 709         down_read(&EXT4_I(inode)->xattr_sem);
 710         if (!ext4_has_inline_data(inode)) {
 711                 ret = 0;
 712                 unlock_page(page);
 713                 put_page(page);
 714                 goto out_up_read;
 715         }
 716
 717         if (!PageUptodate(page)) {
 718                 ret = ext4_read_inline_page(inode, page);
 719                 if (ret < 0)
 720                         goto out_up_read;
 721         }
 722
 723         ret = 1;
 724         handle = NULL;
 725 out_up_read:
 726         up_read(&EXT4_I(inode)->xattr_sem);
 727 out:
 728         if (handle && (ret != 1))
 729                 ext4_journal_stop(handle);
 730         brelse(iloc.bh);
 731         return ret;
 732 convert:
 733         return ext4_convert_inline_data_to_extent(mapping,
 734                                                   inode, flags);
 735 }
 736
 737 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 738                                unsigned copied, struct page *page)
 739 {
 740         int ret, no_expand;
 741         void *kaddr;
 742         struct ext4_iloc iloc;
 743
 744         if (unlikely(copied < len)) {
 745                 if (!PageUptodate(page)) {
 746                         copied = 0;
 747                         goto out;
 748                 }
 749         }
 750
 751         ret = ext4_get_inode_loc(inode, &iloc);
 752         if (ret) {
 753                 ext4_std_error(inode->i_sb, ret);
 754                 copied = 0;
 755                 goto out;
 756         }
 757
 758         ext4_write_lock_xattr(inode, &no_expand);
 759         BUG_ON(!ext4_has_inline_data(inode));
 760
 761         kaddr = kmap_atomic(page);
 762         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 763         kunmap_atomic(kaddr);
 764         SetPageUptodate(page);
 765         /* clear page dirty so that writepages wouldn't work for us. */
 766         ClearPageDirty(page);
 767
 768         ext4_write_unlock_xattr(inode, &no_expand);
 769         brelse(iloc.bh);
 770         mark_inode_dirty(inode);
 771 out:
 772         return copied;
 773 }
 774
 775 struct buffer_head *
 776 ext4_journalled_write_inline_data(struct inode *inode,
 777                                   unsigned len,
 778                                   struct page *page)
 779 {
 780         int ret, no_expand;
 781         void *kaddr;
 782         struct ext4_iloc iloc;
 783
 784         ret = ext4_get_inode_loc(inode, &iloc);
 785         if (ret) {
 786                 ext4_std_error(inode->i_sb, ret);
 787                 return NULL;
 788         }
 789
 790         ext4_write_lock_xattr(inode, &no_expand);
 791         kaddr = kmap_atomic(page);
 792         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 793         kunmap_atomic(kaddr);
 794         ext4_write_unlock_xattr(inode, &no_expand);
 795
 796         return iloc.bh;
 797 }
 798
 799 /*
 800  * Try to make the page cache and handle ready for the inline data case.
 801  * We can call this function in 2 cases:
 802  * 1. The inode is created and the first write exceeds inline size. We can
 803  *    clear the inode state safely.
 804  * 2. The inode has inline data, then we need to read the data, make it
 805  *    update and dirty so that ext4_da_writepages can handle it. We don't
 806  *    need to start the journal since the file's metatdata isn't changed now.
 807  */
 808 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 809                                                  struct inode *inode,
 810                                                  unsigned flags,
 811                                                  void **fsdata)
 812 {
 813         int ret = 0, inline_size;
 814         struct page *page;
 815
 816         page = grab_cache_page_write_begin(mapping, 0, flags);
 817         if (!page)
 818                 return -ENOMEM;
 819
 820         down_read(&EXT4_I(inode)->xattr_sem);
 821         if (!ext4_has_inline_data(inode)) {
 822                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 823                 goto out;
 824         }
 825
 826         inline_size = ext4_get_inline_size(inode);
 827
 828         if (!PageUptodate(page)) {
 829                 ret = ext4_read_inline_page(inode, page);
 830                 if (ret < 0)
 831                         goto out;
 832         }
 833
 834         ret = __block_write_begin(page, 0, inline_size,
 835                                   ext4_da_get_block_prep);
 836         if (ret) {
 837                 up_read(&EXT4_I(inode)->xattr_sem);
 838                 unlock_page(page);
 839                 put_page(page);
 840                 ext4_truncate_failed_write(inode);
 841                 return ret;
 842         }
 843
 844         SetPageDirty(page);
 845         SetPageUptodate(page);
 846         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 847         *fsdata = (void *)CONVERT_INLINE_DATA;
 848
 849 out:
 850         up_read(&EXT4_I(inode)->xattr_sem);
 851         if (page) {
 852                 unlock_page(page);
 853                 put_page(page);
 854         }
 855         return ret;
 856 }
 857
 858 /*
 859  * Prepare the write for the inline data.
 860  * If the the data can be written into the inode, we just read
 861  * the page and make it uptodate, and start the journal.
 862  * Otherwise read the page, makes it dirty so that it can be
 863  * handle in writepages(the i_disksize update is left to the
 864  * normal ext4_da_write_end).
 865  */
 866 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 867                                     struct inode *inode,
 868                                     loff_t pos, unsigned len,
 869                                     unsigned flags,
 870                                     struct page **pagep,
 871                                     void **fsdata)
 872 {
 873         int ret, inline_size;
 874         handle_t *handle;
 875         struct page *page;
 876         struct ext4_iloc iloc;
 877         int retries;
 878
 879         ret = ext4_get_inode_loc(inode, &iloc);
 880         if (ret)
 881                 return ret;
 882
 883 retry_journal:
 884         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 885         if (IS_ERR(handle)) {
 886                 ret = PTR_ERR(handle);
 887                 goto out;
 888         }
 889
 890         inline_size = ext4_get_max_inline_size(inode);
 891
 892         ret = -ENOSPC;
 893         if (inline_size >= pos + len) {
 894                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 895                 if (ret && ret != -ENOSPC)
 896                         goto out_journal;
 897         }
 898
 899         /*
 900          * We cannot recurse into the filesystem as the transaction
 901          * is already started.
 902          */
 903         flags |= AOP_FLAG_NOFS;
 904
 905         if (ret == -ENOSPC) {
 906                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 907                                                             inode,
 908                                                             flags,
 909                                                             fsdata);
 910                 ext4_journal_stop(handle);
 911                 if (ret == -ENOSPC &&
 912                     ext4_should_retry_alloc(inode->i_sb, &retries))
 913                         goto retry_journal;
 914                 goto out;
 915         }
 916
 917         page = grab_cache_page_write_begin(mapping, 0, flags);
 918         if (!page) {
 919                 ret = -ENOMEM;
 920                 goto out_journal;
 921         }
 922
 923         down_read(&EXT4_I(inode)->xattr_sem);
 924         if (!ext4_has_inline_data(inode)) {
 925                 ret = 0;
 926                 goto out_release_page;
 927         }
 928
 929         if (!PageUptodate(page)) {
 930                 ret = ext4_read_inline_page(inode, page);
 931                 if (ret < 0)
 932                         goto out_release_page;
 933         }
 934         ret = ext4_journal_get_write_access(handle, iloc.bh);
 935         if (ret)
 936                 goto out_release_page;
 937
 938         up_read(&EXT4_I(inode)->xattr_sem);
 939         *pagep = page;
 940         brelse(iloc.bh);
 941         return 1;
 942 out_release_page:
 943         up_read(&EXT4_I(inode)->xattr_sem);
 944         unlock_page(page);
 945         put_page(page);
 946 out_journal:
 947         ext4_journal_stop(handle);
 948 out:
 949         brelse(iloc.bh);
 950         return ret;
 951 }
 952
 953 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 954                                   unsigned len, unsigned copied,
 955                                   struct page *page)
 956 {
 957         int ret;
 958
 959         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 960         if (ret < 0) {
 961                 unlock_page(page);
 962                 put_page(page);
 963                 return ret;
 964         }
 965         copied = ret;
 966
 967         /*
 968          * No need to use i_size_read() here, the i_size
 969          * cannot change under us because we hold i_mutex.
 970          *
 971          * But it's important to update i_size while still holding page lock:
 972          * page writeout could otherwise come in and zero beyond i_size.
 973          */
 974         if (pos+copied > inode->i_size)
 975                 i_size_write(inode, pos+copied);
 976         unlock_page(page);
 977         put_page(page);
 978
 979         /*
 980          * Don't mark the inode dirty under page lock. First, it unnecessarily
 981          * makes the holding time of page lock longer. Second, it forces lock
 982          * ordering of page lock and transaction start for journaling
 983          * filesystems.
 984          */
 985         mark_inode_dirty(inode);
 986
 987         return copied;
 988 }
 989
 990 #ifdef INLINE_DIR_DEBUG
 991 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 992                           void *inline_start, int inline_size)
 993 {
 994         int offset;
 995         unsigned short de_len;
 996         struct ext4_dir_entry_2 *de = inline_start;
 997         void *dlimit = inline_start + inline_size;
 998
 999         trace_printk("inode %lu\n", dir->i_ino);
1000         offset = 0;
1001         while ((void *)de < dlimit) {
1002                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
1003                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
1004                              offset, de_len, de->name_len, de->name,
1005                              de->name_len, le32_to_cpu(de->inode));
1006                 if (ext4_check_dir_entry(dir, NULL, de, bh,
1007                                          inline_start, inline_size, offset))
1008                         BUG();
1009
1010                 offset += de_len;
1011                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
1012         }
1013 }
1014 #else
1015 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1016 #endif
1017
1018 /*
1019  * Add a new entry into a inline dir.
1020  * It will return -ENOSPC if no space is available, and -EIO
1021  * and -EEXIST if directory entry already exists.
1022  */
1023 static int ext4_add_dirent_to_inline(handle_t *handle,
1024                                      struct ext4_filename *fname,
1025                                      struct inode *dir,
1026                                      struct inode *inode,
1027                                      struct ext4_iloc *iloc,
1028                                      void *inline_start, int inline_size)
1029 {
1030         int             err;
1031         struct ext4_dir_entry_2 *de;
1032
1033         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1034                                 inline_size, fname, &de);
1035         if (err)
1036                 return err;
1037
1038         BUFFER_TRACE(iloc->bh, "get_write_access");
1039         err = ext4_journal_get_write_access(handle, iloc->bh);
1040         if (err)
1041                 return err;
1042         ext4_insert_dentry(inode, de, inline_size, fname);
1043
1044         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1045
1046         /*
1047          * XXX shouldn't update any times until successful
1048          * completion of syscall, but too many callers depend
1049          * on this.
1050          *
1051          * XXX similarly, too many callers depend on
1052          * ext4_new_inode() setting the times, but error
1053          * recovery deletes the inode, so the worst that can
1054          * happen is that the times are slightly out of date
1055          * and/or different from the directory change time.
1056          */
1057         dir->i_mtime = dir->i_ctime = ext4_current_time(dir);
1058         ext4_update_dx_flag(dir);
1059         dir->i_version++;
1060         ext4_mark_inode_dirty(handle, dir);
1061         return 1;
1062 }
1063
1064 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1065                                        struct ext4_iloc *iloc)
1066 {
1067         struct ext4_xattr_entry *entry;
1068         struct ext4_xattr_ibody_header *header;
1069
1070         BUG_ON(!EXT4_I(inode)->i_inline_off);
1071
1072         header = IHDR(inode, ext4_raw_inode(iloc));
1073         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1074                                             EXT4_I(inode)->i_inline_off);
1075
1076         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1077 }
1078
1079 /* Set the final de to cover the whole block. */
1080 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1081 {
1082         struct ext4_dir_entry_2 *de, *prev_de;
1083         void *limit;
1084         int de_len;
1085
1086         de = (struct ext4_dir_entry_2 *)de_buf;
1087         if (old_size) {
1088                 limit = de_buf + old_size;
1089                 do {
1090                         prev_de = de;
1091                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1092                         de_buf += de_len;
1093                         de = (struct ext4_dir_entry_2 *)de_buf;
1094                 } while (de_buf < limit);
1095
1096                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1097                                                         old_size, new_size);
1098         } else {
1099                 /* this is just created, so create an empty entry. */
1100                 de->inode = 0;
1101                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1102         }
1103 }
1104
1105 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1106                                   struct ext4_iloc *iloc)
1107 {
1108         int ret;
1109         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1110         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1111
1112         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1113                 return -ENOSPC;
1114
1115         ret = ext4_update_inline_data(handle, dir,
1116                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1117         if (ret)
1118                 return ret;
1119
1120         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1121                              EXT4_I(dir)->i_inline_size -
1122                                                 EXT4_MIN_INLINE_DATA_SIZE);
1123         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1124         return 0;
1125 }
1126
1127 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1128                                      struct ext4_iloc *iloc,
1129                                      void *buf, int inline_size)
1130 {
1131         ext4_create_inline_data(handle, inode, inline_size);
1132         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1133         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1134 }
1135
1136 static int ext4_finish_convert_inline_dir(handle_t *handle,
1137                                           struct inode *inode,
1138                                           struct buffer_head *dir_block,
1139                                           void *buf,
1140                                           int inline_size)
1141 {
1142         int err, csum_size = 0, header_size = 0;
1143         struct ext4_dir_entry_2 *de;
1144         struct ext4_dir_entry_tail *t;
1145         void *target = dir_block->b_data;
1146
1147         /*
1148          * First create "." and ".." and then copy the dir information
1149          * back to the block.
1150          */
1151         de = (struct ext4_dir_entry_2 *)target;
1152         de = ext4_init_dot_dotdot(inode, de,
1153                 inode->i_sb->s_blocksize, csum_size,
1154                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1155         header_size = (void *)de - target;
1156
1157         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1158                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1159
1160         if (ext4_has_metadata_csum(inode->i_sb))
1161                 csum_size = sizeof(struct ext4_dir_entry_tail);
1162
1163         inode->i_size = inode->i_sb->s_blocksize;
1164         i_size_write(inode, inode->i_sb->s_blocksize);
1165         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1166         ext4_update_final_de(dir_block->b_data,
1167                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1168                         inode->i_sb->s_blocksize - csum_size);
1169
1170         if (csum_size) {
1171                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1172                                      inode->i_sb->s_blocksize);
1173                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1174         }
1175         set_buffer_uptodate(dir_block);
1176         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1177         if (err)
1178                 return err;
1179         set_buffer_verified(dir_block);
1180         return ext4_mark_inode_dirty(handle, inode);
1181 }
1182
1183 static int ext4_convert_inline_data_nolock(handle_t *handle,
1184                                            struct inode *inode,
1185                                            struct ext4_iloc *iloc)
1186 {
1187         int error;
1188         void *buf = NULL;
1189         struct buffer_head *data_bh = NULL;
1190         struct ext4_map_blocks map;
1191         int inline_size;
1192
1193         inline_size = ext4_get_inline_size(inode);
1194         buf = kmalloc(inline_size, GFP_NOFS);
1195         if (!buf) {
1196                 error = -ENOMEM;
1197                 goto out;
1198         }
1199
1200         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1201         if (error < 0)
1202                 goto out;
1203
1204         /*
1205          * Make sure the inline directory entries pass checks before we try to
1206          * convert them, so that we avoid touching stuff that needs fsck.
1207          */
1208         if (S_ISDIR(inode->i_mode)) {
1209                 error = ext4_check_all_de(inode, iloc->bh,
1210                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1211                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1212                 if (error)
1213                         goto out;
1214         }
1215
1216         error = ext4_destroy_inline_data_nolock(handle, inode);
1217         if (error)
1218                 goto out;
1219
1220         map.m_lblk = 0;
1221         map.m_len = 1;
1222         map.m_flags = 0;
1223         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1224         if (error < 0)
1225                 goto out_restore;
1226         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1227                 error = -EIO;
1228                 goto out_restore;
1229         }
1230
1231         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1232         if (!data_bh) {
1233                 error = -ENOMEM;
1234                 goto out_restore;
1235         }
1236
1237         lock_buffer(data_bh);
1238         error = ext4_journal_get_create_access(handle, data_bh);
1239         if (error) {
1240                 unlock_buffer(data_bh);
1241                 error = -EIO;
1242                 goto out_restore;
1243         }
1244         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1245
1246         if (!S_ISDIR(inode->i_mode)) {
1247                 memcpy(data_bh->b_data, buf, inline_size);
1248                 set_buffer_uptodate(data_bh);
1249                 error = ext4_handle_dirty_metadata(handle,
1250                                                    inode, data_bh);
1251         } else {
1252                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1253                                                        buf, inline_size);
1254         }
1255
1256         unlock_buffer(data_bh);
1257 out_restore:
1258         if (error)
1259                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1260
1261 out:
1262         brelse(data_bh);
1263         kfree(buf);
1264         return error;
1265 }
1266
1267 /*
1268  * Try to add the new entry to the inline data.
1269  * If succeeds, return 0. If not, extended the inline dir and copied data to
1270  * the new created block.
1271  */
1272 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1273                               struct inode *dir, struct inode *inode)
1274 {
1275         int ret, inline_size, no_expand;
1276         void *inline_start;
1277         struct ext4_iloc iloc;
1278
1279         ret = ext4_get_inode_loc(dir, &iloc);
1280         if (ret)
1281                 return ret;
1282
1283         ext4_write_lock_xattr(dir, &no_expand);
1284         if (!ext4_has_inline_data(dir))
1285                 goto out;
1286
1287         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1288                                                  EXT4_INLINE_DOTDOT_SIZE;
1289         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1290
1291         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1292                                         inline_start, inline_size);
1293         if (ret != -ENOSPC)
1294                 goto out;
1295
1296         /* check whether it can be inserted to inline xattr space. */
1297         inline_size = EXT4_I(dir)->i_inline_size -
1298                         EXT4_MIN_INLINE_DATA_SIZE;
1299         if (!inline_size) {
1300                 /* Try to use the xattr space.*/
1301                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1302                 if (ret && ret != -ENOSPC)
1303                         goto out;
1304
1305                 inline_size = EXT4_I(dir)->i_inline_size -
1306                                 EXT4_MIN_INLINE_DATA_SIZE;
1307         }
1308
1309         if (inline_size) {
1310                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1311
1312                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1313                                                 inode, &iloc, inline_start,
1314                                                 inline_size);
1315
1316                 if (ret != -ENOSPC)
1317                         goto out;
1318         }
1319
1320         /*
1321          * The inline space is filled up, so create a new block for it.
1322          * As the extent tree will be created, we have to save the inline
1323          * dir first.
1324          */
1325         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1326
1327 out:
1328         ext4_mark_inode_dirty(handle, dir);
1329         ext4_write_unlock_xattr(dir, &no_expand);
1330         brelse(iloc.bh);
1331         return ret;
1332 }
1333
1334 /*
1335  * This function fills a red-black tree with information from an
1336  * inlined dir.  It returns the number directory entries loaded
1337  * into the tree.  If there is an error it is returned in err.
1338  */
1339 int htree_inlinedir_to_tree(struct file *dir_file,
1340                             struct inode *dir, ext4_lblk_t block,
1341                             struct dx_hash_info *hinfo,
1342                             __u32 start_hash, __u32 start_minor_hash,
1343                             int *has_inline_data)
1344 {
1345         int err = 0, count = 0;
1346         unsigned int parent_ino;
1347         int pos;
1348         struct ext4_dir_entry_2 *de;
1349         struct inode *inode = file_inode(dir_file);
1350         int ret, inline_size = 0;
1351         struct ext4_iloc iloc;
1352         void *dir_buf = NULL;
1353         struct ext4_dir_entry_2 fake;
1354         struct fscrypt_str tmp_str;
1355
1356         ret = ext4_get_inode_loc(inode, &iloc);
1357         if (ret)
1358                 return ret;
1359
1360         down_read(&EXT4_I(inode)->xattr_sem);
1361         if (!ext4_has_inline_data(inode)) {
1362                 up_read(&EXT4_I(inode)->xattr_sem);
1363                 *has_inline_data = 0;
1364                 goto out;
1365         }
1366
1367         inline_size = ext4_get_inline_size(inode);
1368         dir_buf = kmalloc(inline_size, GFP_NOFS);
1369         if (!dir_buf) {
1370                 ret = -ENOMEM;
1371                 up_read(&EXT4_I(inode)->xattr_sem);
1372                 goto out;
1373         }
1374
1375         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1376         up_read(&EXT4_I(inode)->xattr_sem);
1377         if (ret < 0)
1378                 goto out;
1379
1380         pos = 0;
1381         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1382         while (pos < inline_size) {
1383                 /*
1384                  * As inlined dir doesn't store any information about '.' and
1385                  * only the inode number of '..' is stored, we have to handle
1386                  * them differently.
1387                  */
1388                 if (pos == 0) {
1389                         fake.inode = cpu_to_le32(inode->i_ino);
1390                         fake.name_len = 1;
1391                         strcpy(fake.name, ".");
1392                         fake.rec_len = ext4_rec_len_to_disk(
1393                                                 EXT4_DIR_REC_LEN(fake.name_len),
1394                                                 inline_size);
1395                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1396                         de = &fake;
1397                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1398                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1399                         fake.inode = cpu_to_le32(parent_ino);
1400                         fake.name_len = 2;
1401                         strcpy(fake.name, "..");
1402                         fake.rec_len = ext4_rec_len_to_disk(
1403                                                 EXT4_DIR_REC_LEN(fake.name_len),
1404                                                 inline_size);
1405                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1406                         de = &fake;
1407                         pos = EXT4_INLINE_DOTDOT_SIZE;
1408                 } else {
1409                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1410                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1411                         if (ext4_check_dir_entry(inode, dir_file, de,
1412                                          iloc.bh, dir_buf,
1413                                          inline_size, pos)) {
1414                                 ret = count;
1415                                 goto out;
1416                         }
1417                 }
1418
1419                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1420                 if ((hinfo->hash < start_hash) ||
1421                     ((hinfo->hash == start_hash) &&
1422                      (hinfo->minor_hash < start_minor_hash)))
1423                         continue;
1424                 if (de->inode == 0)
1425                         continue;
1426                 tmp_str.name = de->name;
1427                 tmp_str.len = de->name_len;
1428                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1429                                               hinfo->minor_hash, de, &tmp_str);
1430                 if (err) {
1431                         count = err;
1432                         goto out;
1433                 }
1434                 count++;
1435         }
1436         ret = count;
1437 out:
1438         kfree(dir_buf);
1439         brelse(iloc.bh);
1440         return ret;
1441 }
1442
1443 /*
1444  * So this function is called when the volume is mkfsed with
1445  * dir_index disabled. In order to keep f_pos persistent
1446  * after we convert from an inlined dir to a blocked based,
1447  * we just pretend that we are a normal dir and return the
1448  * offset as if '.' and '..' really take place.
1449  *
1450  */
1451 int ext4_read_inline_dir(struct file *file,
1452                          struct dir_context *ctx,
1453                          int *has_inline_data)
1454 {
1455         unsigned int offset, parent_ino;
1456         int i;
1457         struct ext4_dir_entry_2 *de;
1458         struct super_block *sb;
1459         struct inode *inode = file_inode(file);
1460         int ret, inline_size = 0;
1461         struct ext4_iloc iloc;
1462         void *dir_buf = NULL;
1463         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1464
1465         ret = ext4_get_inode_loc(inode, &iloc);
1466         if (ret)
1467                 return ret;
1468
1469         down_read(&EXT4_I(inode)->xattr_sem);
1470         if (!ext4_has_inline_data(inode)) {
1471                 up_read(&EXT4_I(inode)->xattr_sem);
1472                 *has_inline_data = 0;
1473                 goto out;
1474         }
1475
1476         inline_size = ext4_get_inline_size(inode);
1477         dir_buf = kmalloc(inline_size, GFP_NOFS);
1478         if (!dir_buf) {
1479                 ret = -ENOMEM;
1480                 up_read(&EXT4_I(inode)->xattr_sem);
1481                 goto out;
1482         }
1483
1484         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1485         up_read(&EXT4_I(inode)->xattr_sem);
1486         if (ret < 0)
1487                 goto out;
1488
1489         ret = 0;
1490         sb = inode->i_sb;
1491         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1492         offset = ctx->pos;
1493
1494         /*
1495          * dotdot_offset and dotdot_size is the real offset and
1496          * size for ".." and "." if the dir is block based while
1497          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1498          * So we will use extra_offset and extra_size to indicate them
1499          * during the inline dir iteration.
1500          */
1501         dotdot_offset = EXT4_DIR_REC_LEN(1);
1502         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1503         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1504         extra_size = extra_offset + inline_size;
1505
1506         /*
1507          * If the version has changed since the last call to
1508          * readdir(2), then we might be pointing to an invalid
1509          * dirent right now.  Scan from the start of the inline
1510          * dir to make sure.
1511          */
1512         if (file->f_version != inode->i_version) {
1513                 for (i = 0; i < extra_size && i < offset;) {
1514                         /*
1515                          * "." is with offset 0 and
1516                          * ".." is dotdot_offset.
1517                          */
1518                         if (!i) {
1519                                 i = dotdot_offset;
1520                                 continue;
1521                         } else if (i == dotdot_offset) {
1522                                 i = dotdot_size;
1523                                 continue;
1524                         }
1525                         /* for other entry, the real offset in
1526                          * the buf has to be tuned accordingly.
1527                          */
1528                         de = (struct ext4_dir_entry_2 *)
1529                                 (dir_buf + i - extra_offset);
1530                         /* It's too expensive to do a full
1531                          * dirent test each time round this
1532                          * loop, but we do have to test at
1533                          * least that it is non-zero.  A
1534                          * failure will be detected in the
1535                          * dirent test below. */
1536                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1537                                 < EXT4_DIR_REC_LEN(1))
1538                                 break;
1539                         i += ext4_rec_len_from_disk(de->rec_len,
1540                                                     extra_size);
1541                 }
1542                 offset = i;
1543                 ctx->pos = offset;
1544                 file->f_version = inode->i_version;
1545         }
1546
1547         while (ctx->pos < extra_size) {
1548                 if (ctx->pos == 0) {
1549                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1550                                 goto out;
1551                         ctx->pos = dotdot_offset;
1552                         continue;
1553                 }
1554
1555                 if (ctx->pos == dotdot_offset) {
1556                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1557                                 goto out;
1558                         ctx->pos = dotdot_size;
1559                         continue;
1560                 }
1561
1562                 de = (struct ext4_dir_entry_2 *)
1563                         (dir_buf + ctx->pos - extra_offset);
1564                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1565                                          extra_size, ctx->pos))
1566                         goto out;
1567                 if (le32_to_cpu(de->inode)) {
1568                         if (!dir_emit(ctx, de->name, de->name_len,
1569                                       le32_to_cpu(de->inode),
1570                                       get_dtype(sb, de->file_type)))
1571                                 goto out;
1572                 }
1573                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1574         }
1575 out:
1576         kfree(dir_buf);
1577         brelse(iloc.bh);
1578         return ret;
1579 }
1580
1581 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1582                                         struct ext4_dir_entry_2 **parent_de,
1583                                         int *retval)
1584 {
1585         struct ext4_iloc iloc;
1586
1587         *retval = ext4_get_inode_loc(inode, &iloc);
1588         if (*retval)
1589                 return NULL;
1590
1591         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1592
1593         return iloc.bh;
1594 }
1595
1596 /*
1597  * Try to create the inline data for the new dir.
1598  * If it succeeds, return 0, otherwise return the error.
1599  * In case of ENOSPC, the caller should create the normal disk layout dir.
1600  */
1601 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1602                                struct inode *inode)
1603 {
1604         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1605         struct ext4_iloc iloc;
1606         struct ext4_dir_entry_2 *de;
1607
1608         ret = ext4_get_inode_loc(inode, &iloc);
1609         if (ret)
1610                 return ret;
1611
1612         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1613         if (ret)
1614                 goto out;
1615
1616         /*
1617          * For inline dir, we only save the inode information for the ".."
1618          * and create a fake dentry to cover the left space.
1619          */
1620         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1621         de->inode = cpu_to_le32(parent->i_ino);
1622         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1623         de->inode = 0;
1624         de->rec_len = ext4_rec_len_to_disk(
1625                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1626                                 inline_size);
1627         set_nlink(inode, 2);
1628         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1629 out:
1630         brelse(iloc.bh);
1631         return ret;
1632 }
1633
1634 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1635                                         struct ext4_filename *fname,
1636                                         const struct qstr *d_name,
1637                                         struct ext4_dir_entry_2 **res_dir,
1638                                         int *has_inline_data)
1639 {
1640         int ret;
1641         struct ext4_iloc iloc;
1642         void *inline_start;
1643         int inline_size;
1644
1645         if (ext4_get_inode_loc(dir, &iloc))
1646                 return NULL;
1647
1648         down_read(&EXT4_I(dir)->xattr_sem);
1649         if (!ext4_has_inline_data(dir)) {
1650                 *has_inline_data = 0;
1651                 goto out;
1652         }
1653
1654         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1655                                                 EXT4_INLINE_DOTDOT_SIZE;
1656         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1657         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1658                               dir, fname, d_name, 0, res_dir);
1659         if (ret == 1)
1660                 goto out_find;
1661         if (ret < 0)
1662                 goto out;
1663
1664         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1665                 goto out;
1666
1667         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1668         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1669
1670         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1671                               dir, fname, d_name, 0, res_dir);
1672         if (ret == 1)
1673                 goto out_find;
1674
1675 out:
1676         brelse(iloc.bh);
1677         iloc.bh = NULL;
1678 out_find:
1679         up_read(&EXT4_I(dir)->xattr_sem);
1680         return iloc.bh;
1681 }
1682
1683 int ext4_delete_inline_entry(handle_t *handle,
1684                              struct inode *dir,
1685                              struct ext4_dir_entry_2 *de_del,
1686                              struct buffer_head *bh,
1687                              int *has_inline_data)
1688 {
1689         int err, inline_size, no_expand;
1690         struct ext4_iloc iloc;
1691         void *inline_start;
1692
1693         err = ext4_get_inode_loc(dir, &iloc);
1694         if (err)
1695                 return err;
1696
1697         ext4_write_lock_xattr(dir, &no_expand);
1698         if (!ext4_has_inline_data(dir)) {
1699                 *has_inline_data = 0;
1700                 goto out;
1701         }
1702
1703         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1704                 EXT4_MIN_INLINE_DATA_SIZE) {
1705                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1706                                         EXT4_INLINE_DOTDOT_SIZE;
1707                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1708                                 EXT4_INLINE_DOTDOT_SIZE;
1709         } else {
1710                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1711                 inline_size = ext4_get_inline_size(dir) -
1712                                 EXT4_MIN_INLINE_DATA_SIZE;
1713         }
1714
1715         BUFFER_TRACE(bh, "get_write_access");
1716         err = ext4_journal_get_write_access(handle, bh);
1717         if (err)
1718                 goto out;
1719
1720         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1721                                         inline_start, inline_size, 0);
1722         if (err)
1723                 goto out;
1724
1725         err = ext4_mark_inode_dirty(handle, dir);
1726         if (unlikely(err))
1727                 goto out;
1728
1729         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1730 out:
1731         ext4_write_unlock_xattr(dir, &no_expand);
1732         brelse(iloc.bh);
1733         if (err != -ENOENT)
1734                 ext4_std_error(dir->i_sb, err);
1735         return err;
1736 }
1737
1738 /*
1739  * Get the inline dentry at offset.
1740  */
1741 static inline struct ext4_dir_entry_2 *
1742 ext4_get_inline_entry(struct inode *inode,
1743                       struct ext4_iloc *iloc,
1744                       unsigned int offset,
1745                       void **inline_start,
1746                       int *inline_size)
1747 {
1748         void *inline_pos;
1749
1750         BUG_ON(offset > ext4_get_inline_size(inode));
1751
1752         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1753                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1754                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1755         } else {
1756                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1757                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1758                 *inline_size = ext4_get_inline_size(inode) -
1759                                 EXT4_MIN_INLINE_DATA_SIZE;
1760         }
1761
1762         if (inline_start)
1763                 *inline_start = inline_pos;
1764         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1765 }
1766
1767 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1768 {
1769         int err, inline_size;
1770         struct ext4_iloc iloc;
1771         void *inline_pos;
1772         unsigned int offset;
1773         struct ext4_dir_entry_2 *de;
1774         bool ret = true;
1775
1776         err = ext4_get_inode_loc(dir, &iloc);
1777         if (err) {
1778                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1779                                  err, dir->i_ino);
1780                 return true;
1781         }
1782
1783         down_read(&EXT4_I(dir)->xattr_sem);
1784         if (!ext4_has_inline_data(dir)) {
1785                 *has_inline_data = 0;
1786                 goto out;
1787         }
1788
1789         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1790         if (!le32_to_cpu(de->inode)) {
1791                 ext4_warning(dir->i_sb,
1792                              "bad inline directory (dir #%lu) - no `..'",
1793                              dir->i_ino);
1794                 ret = true;
1795                 goto out;
1796         }
1797
1798         offset = EXT4_INLINE_DOTDOT_SIZE;
1799         while (offset < dir->i_size) {
1800                 de = ext4_get_inline_entry(dir, &iloc, offset,
1801                                            &inline_pos, &inline_size);
1802                 if (ext4_check_dir_entry(dir, NULL, de,
1803                                          iloc.bh, inline_pos,
1804                                          inline_size, offset)) {
1805                         ext4_warning(dir->i_sb,
1806                                      "bad inline directory (dir #%lu) - "
1807                                      "inode %u, rec_len %u, name_len %d"
1808                                      "inline size %d",
1809                                      dir->i_ino, le32_to_cpu(de->inode),
1810                                      le16_to_cpu(de->rec_len), de->name_len,
1811                                      inline_size);
1812                         ret = true;
1813                         goto out;
1814                 }
1815                 if (le32_to_cpu(de->inode)) {
1816                         ret = false;
1817                         goto out;
1818                 }
1819                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1820         }
1821
1822 out:
1823         up_read(&EXT4_I(dir)->xattr_sem);
1824         brelse(iloc.bh);
1825         return ret;
1826 }
1827
1828 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1829 {
1830         int ret, no_expand;
1831
1832         ext4_write_lock_xattr(inode, &no_expand);
1833         ret = ext4_destroy_inline_data_nolock(handle, inode);
1834         ext4_write_unlock_xattr(inode, &no_expand);
1835
1836         return ret;
1837 }
1838
1839 int ext4_inline_data_fiemap(struct inode *inode,
1840                             struct fiemap_extent_info *fieinfo,
1841                             int *has_inline, __u64 start, __u64 len)
1842 {
1843         __u64 physical = 0;
1844         __u64 inline_len;
1845         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1846                 FIEMAP_EXTENT_LAST;
1847         int error = 0;
1848         struct ext4_iloc iloc;
1849
1850         down_read(&EXT4_I(inode)->xattr_sem);
1851         if (!ext4_has_inline_data(inode)) {
1852                 *has_inline = 0;
1853                 goto out;
1854         }
1855         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1856                            i_size_read(inode));
1857         if (start >= inline_len)
1858                 goto out;
1859         if (start + len < inline_len)
1860                 inline_len = start + len;
1861         inline_len -= start;
1862
1863         error = ext4_get_inode_loc(inode, &iloc);
1864         if (error)
1865                 goto out;
1866
1867         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1868         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1869         physical += offsetof(struct ext4_inode, i_block);
1870
1871         if (physical)
1872                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1873                                                 inline_len, flags);
1874         brelse(iloc.bh);
1875 out:
1876         up_read(&EXT4_I(inode)->xattr_sem);
1877         return (error < 0 ? error : 0);
1878 }
1879
1880 /*
1881  * Called during xattr set, and if we can sparse space 'needed',
1882  * just create the extent tree evict the data to the outer block.
1883  *
1884  * We use jbd2 instead of page cache to move data to the 1st block
1885  * so that the whole transaction can be committed as a whole and
1886  * the data isn't lost because of the delayed page cache write.
1887  */
1888 int ext4_try_to_evict_inline_data(handle_t *handle,
1889                                   struct inode *inode,
1890                                   int needed)
1891 {
1892         int error;
1893         struct ext4_xattr_entry *entry;
1894         struct ext4_inode *raw_inode;
1895         struct ext4_iloc iloc;
1896
1897         error = ext4_get_inode_loc(inode, &iloc);
1898         if (error)
1899                 return error;
1900
1901         raw_inode = ext4_raw_inode(&iloc);
1902         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1903                                             EXT4_I(inode)->i_inline_off);
1904         if (EXT4_XATTR_LEN(entry->e_name_len) +
1905             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1906                 error = -ENOSPC;
1907                 goto out;
1908         }
1909
1910         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1911 out:
1912         brelse(iloc.bh);
1913         return error;
1914 }
1915
1916 void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1917 {
1918         handle_t *handle;
1919         int inline_size, value_len, needed_blocks, no_expand;
1920         size_t i_size;
1921         void *value = NULL;
1922         struct ext4_xattr_ibody_find is = {
1923                 .s = { .not_found = -ENODATA, },
1924         };
1925         struct ext4_xattr_info i = {
1926                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1927                 .name = EXT4_XATTR_SYSTEM_DATA,
1928         };
1929
1930
1931         needed_blocks = ext4_writepage_trans_blocks(inode);
1932         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1933         if (IS_ERR(handle))
1934                 return;
1935
1936         ext4_write_lock_xattr(inode, &no_expand);
1937         if (!ext4_has_inline_data(inode)) {
1938                 *has_inline = 0;
1939                 ext4_journal_stop(handle);
1940                 return;
1941         }
1942
1943         if (ext4_orphan_add(handle, inode))
1944                 goto out;
1945
1946         if (ext4_get_inode_loc(inode, &is.iloc))
1947                 goto out;
1948
1949         down_write(&EXT4_I(inode)->i_data_sem);
1950         i_size = inode->i_size;
1951         inline_size = ext4_get_inline_size(inode);
1952         EXT4_I(inode)->i_disksize = i_size;
1953
1954         if (i_size < inline_size) {
1955                 /* Clear the content in the xattr space. */
1956                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1957                         if (ext4_xattr_ibody_find(inode, &i, &is))
1958                                 goto out_error;
1959
1960                         BUG_ON(is.s.not_found);
1961
1962                         value_len = le32_to_cpu(is.s.here->e_value_size);
1963                         value = kmalloc(value_len, GFP_NOFS);
1964                         if (!value)
1965                                 goto out_error;
1966
1967                         if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
1968                                                 value, value_len))
1969                                 goto out_error;
1970
1971                         i.value = value;
1972                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1973                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1974                         if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
1975                                 goto out_error;
1976                 }
1977
1978                 /* Clear the content within i_blocks. */
1979                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1980                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1981                         memset(p + i_size, 0,
1982                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
1983                 }
1984
1985                 EXT4_I(inode)->i_inline_size = i_size <
1986                                         EXT4_MIN_INLINE_DATA_SIZE ?
1987                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
1988         }
1989
1990 out_error:
1991         up_write(&EXT4_I(inode)->i_data_sem);
1992 out:
1993         brelse(is.iloc.bh);
1994         ext4_write_unlock_xattr(inode, &no_expand);
1995         kfree(value);
1996         if (inode->i_nlink)
1997                 ext4_orphan_del(handle, inode);
1998
1999         inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
2000         ext4_mark_inode_dirty(handle, inode);
2001         if (IS_SYNC(inode))
2002                 ext4_handle_sync(handle);
2003
2004         ext4_journal_stop(handle);
2005         return;
2006 }
2007
2008 int ext4_convert_inline_data(struct inode *inode)
2009 {
2010         int error, needed_blocks, no_expand;
2011         handle_t *handle;
2012         struct ext4_iloc iloc;
2013
2014         if (!ext4_has_inline_data(inode)) {
2015                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2016                 return 0;
2017         }
2018
2019         needed_blocks = ext4_writepage_trans_blocks(inode);
2020
2021         iloc.bh = NULL;
2022         error = ext4_get_inode_loc(inode, &iloc);
2023         if (error)
2024                 return error;
2025
2026         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2027         if (IS_ERR(handle)) {
2028                 error = PTR_ERR(handle);
2029                 goto out_free;
2030         }
2031
2032         ext4_write_lock_xattr(inode, &no_expand);
2033         if (ext4_has_inline_data(inode))
2034                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2035         ext4_write_unlock_xattr(inode, &no_expand);
2036         ext4_journal_stop(handle);
2037 out_free:
2038         brelse(iloc.bh);
2039         return error;
2040 }