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/iomap.h>
  16 #include <linux/fiemap.h>
  17 #include <linux/iversion.h>
  18
  19 #include "ext4_jbd2.h"
  20 #include "ext4.h"
  21 #include "xattr.h"
  22 #include "truncate.h"
  23
  24 #define EXT4_XATTR_SYSTEM_DATA  "data"
  25 #define EXT4_MIN_INLINE_DATA_SIZE       ((sizeof(__le32) * EXT4_N_BLOCKS))
  26 #define EXT4_INLINE_DOTDOT_OFFSET       2
  27 #define EXT4_INLINE_DOTDOT_SIZE         4
  28
  29 static int ext4_get_inline_size(struct inode *inode)
  30 {
  31         if (EXT4_I(inode)->i_inline_off)
  32                 return EXT4_I(inode)->i_inline_size;
  33
  34         return 0;
  35 }
  36
  37 static int get_max_inline_xattr_value_size(struct inode *inode,
  38                                            struct ext4_iloc *iloc)
  39 {
  40         struct ext4_xattr_ibody_header *header;
  41         struct ext4_xattr_entry *entry;
  42         struct ext4_inode *raw_inode;
  43         int free, min_offs;
  44
  45         min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
  46                         EXT4_GOOD_OLD_INODE_SIZE -
  47                         EXT4_I(inode)->i_extra_isize -
  48                         sizeof(struct ext4_xattr_ibody_header);
  49
  50         /*
  51          * We need to subtract another sizeof(__u32) since an in-inode xattr
  52          * needs an empty 4 bytes to indicate the gap between the xattr entry
  53          * and the name/value pair.
  54          */
  55         if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
  56                 return EXT4_XATTR_SIZE(min_offs -
  57                         EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
  58                         EXT4_XATTR_ROUND - sizeof(__u32));
  59
  60         raw_inode = ext4_raw_inode(iloc);
  61         header = IHDR(inode, raw_inode);
  62         entry = IFIRST(header);
  63
  64         /* Compute min_offs. */
  65         for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
  66                 if (!entry->e_value_inum && entry->e_value_size) {
  67                         size_t offs = le16_to_cpu(entry->e_value_offs);
  68                         if (offs < min_offs)
  69                                 min_offs = offs;
  70                 }
  71         }
  72         free = min_offs -
  73                 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
  74
  75         if (EXT4_I(inode)->i_inline_off) {
  76                 entry = (struct ext4_xattr_entry *)
  77                         ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
  78
  79                 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
  80                 goto out;
  81         }
  82
  83         free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
  84
  85         if (free > EXT4_XATTR_ROUND)
  86                 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
  87         else
  88                 free = 0;
  89
  90 out:
  91         return free;
  92 }
  93
  94 /*
  95  * Get the maximum size we now can store in an inode.
  96  * If we can't find the space for a xattr entry, don't use the space
  97  * of the extents since we have no space to indicate the inline data.
  98  */
  99 int ext4_get_max_inline_size(struct inode *inode)
 100 {
 101         int error, max_inline_size;
 102         struct ext4_iloc iloc;
 103
 104         if (EXT4_I(inode)->i_extra_isize == 0)
 105                 return 0;
 106
 107         error = ext4_get_inode_loc(inode, &iloc);
 108         if (error) {
 109                 ext4_error_inode(inode, __func__, __LINE__, 0,
 110                                  "can't get inode location %lu",
 111                                  inode->i_ino);
 112                 return 0;
 113         }
 114
 115         down_read(&EXT4_I(inode)->xattr_sem);
 116         max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
 117         up_read(&EXT4_I(inode)->xattr_sem);
 118
 119         brelse(iloc.bh);
 120
 121         if (!max_inline_size)
 122                 return 0;
 123
 124         return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
 125 }
 126
 127 /*
 128  * this function does not take xattr_sem, which is OK because it is
 129  * currently only used in a code path coming form ext4_iget, before
 130  * the new inode has been unlocked
 131  */
 132 int ext4_find_inline_data_nolock(struct inode *inode)
 133 {
 134         struct ext4_xattr_ibody_find is = {
 135                 .s = { .not_found = -ENODATA, },
 136         };
 137         struct ext4_xattr_info i = {
 138                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 139                 .name = EXT4_XATTR_SYSTEM_DATA,
 140         };
 141         int error;
 142
 143         if (EXT4_I(inode)->i_extra_isize == 0)
 144                 return 0;
 145
 146         error = ext4_get_inode_loc(inode, &is.iloc);
 147         if (error)
 148                 return error;
 149
 150         error = ext4_xattr_ibody_find(inode, &i, &is);
 151         if (error)
 152                 goto out;
 153
 154         if (!is.s.not_found) {
 155                 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 156                                         (void *)ext4_raw_inode(&is.iloc));
 157                 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 158                                 le32_to_cpu(is.s.here->e_value_size);
 159                 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 160         }
 161 out:
 162         brelse(is.iloc.bh);
 163         return error;
 164 }
 165
 166 static int ext4_read_inline_data(struct inode *inode, void *buffer,
 167                                  unsigned int len,
 168                                  struct ext4_iloc *iloc)
 169 {
 170         struct ext4_xattr_entry *entry;
 171         struct ext4_xattr_ibody_header *header;
 172         int cp_len = 0;
 173         struct ext4_inode *raw_inode;
 174
 175         if (!len)
 176                 return 0;
 177
 178         BUG_ON(len > EXT4_I(inode)->i_inline_size);
 179
 180         cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
 181                         len : EXT4_MIN_INLINE_DATA_SIZE;
 182
 183         raw_inode = ext4_raw_inode(iloc);
 184         memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
 185
 186         len -= cp_len;
 187         buffer += cp_len;
 188
 189         if (!len)
 190                 goto out;
 191
 192         header = IHDR(inode, raw_inode);
 193         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 194                                             EXT4_I(inode)->i_inline_off);
 195         len = min_t(unsigned int, len,
 196                     (unsigned int)le32_to_cpu(entry->e_value_size));
 197
 198         memcpy(buffer,
 199                (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
 200         cp_len += len;
 201
 202 out:
 203         return cp_len;
 204 }
 205
 206 /*
 207  * write the buffer to the inline inode.
 208  * If 'create' is set, we don't need to do the extra copy in the xattr
 209  * value since it is already handled by ext4_xattr_ibody_inline_set.
 210  * That saves us one memcpy.
 211  */
 212 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
 213                                    void *buffer, loff_t pos, unsigned int len)
 214 {
 215         struct ext4_xattr_entry *entry;
 216         struct ext4_xattr_ibody_header *header;
 217         struct ext4_inode *raw_inode;
 218         int cp_len = 0;
 219
 220         if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 221                 return;
 222
 223         BUG_ON(!EXT4_I(inode)->i_inline_off);
 224         BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
 225
 226         raw_inode = ext4_raw_inode(iloc);
 227         buffer += pos;
 228
 229         if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
 230                 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
 231                          EXT4_MIN_INLINE_DATA_SIZE - pos : len;
 232                 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
 233
 234                 len -= cp_len;
 235                 buffer += cp_len;
 236                 pos += cp_len;
 237         }
 238
 239         if (!len)
 240                 return;
 241
 242         pos -= EXT4_MIN_INLINE_DATA_SIZE;
 243         header = IHDR(inode, raw_inode);
 244         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
 245                                             EXT4_I(inode)->i_inline_off);
 246
 247         memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
 248                buffer, len);
 249 }
 250
 251 static int ext4_create_inline_data(handle_t *handle,
 252                                    struct inode *inode, unsigned len)
 253 {
 254         int error;
 255         void *value = NULL;
 256         struct ext4_xattr_ibody_find is = {
 257                 .s = { .not_found = -ENODATA, },
 258         };
 259         struct ext4_xattr_info i = {
 260                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 261                 .name = EXT4_XATTR_SYSTEM_DATA,
 262         };
 263
 264         error = ext4_get_inode_loc(inode, &is.iloc);
 265         if (error)
 266                 return error;
 267
 268         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 269         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 270         if (error)
 271                 goto out;
 272
 273         if (len > EXT4_MIN_INLINE_DATA_SIZE) {
 274                 value = EXT4_ZERO_XATTR_VALUE;
 275                 len -= EXT4_MIN_INLINE_DATA_SIZE;
 276         } else {
 277                 value = "";
 278                 len = 0;
 279         }
 280
 281         /* Insert the the xttr entry. */
 282         i.value = value;
 283         i.value_len = len;
 284
 285         error = ext4_xattr_ibody_find(inode, &i, &is);
 286         if (error)
 287                 goto out;
 288
 289         BUG_ON(!is.s.not_found);
 290
 291         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 292         if (error) {
 293                 if (error == -ENOSPC)
 294                         ext4_clear_inode_state(inode,
 295                                                EXT4_STATE_MAY_INLINE_DATA);
 296                 goto out;
 297         }
 298
 299         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 300                 0, EXT4_MIN_INLINE_DATA_SIZE);
 301
 302         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 303                                       (void *)ext4_raw_inode(&is.iloc));
 304         EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
 305         ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
 306         ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 307         get_bh(is.iloc.bh);
 308         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 309
 310 out:
 311         brelse(is.iloc.bh);
 312         return error;
 313 }
 314
 315 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
 316                                    unsigned int len)
 317 {
 318         int error;
 319         void *value = NULL;
 320         struct ext4_xattr_ibody_find is = {
 321                 .s = { .not_found = -ENODATA, },
 322         };
 323         struct ext4_xattr_info i = {
 324                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 325                 .name = EXT4_XATTR_SYSTEM_DATA,
 326         };
 327
 328         /* If the old space is ok, write the data directly. */
 329         if (len <= EXT4_I(inode)->i_inline_size)
 330                 return 0;
 331
 332         error = ext4_get_inode_loc(inode, &is.iloc);
 333         if (error)
 334                 return error;
 335
 336         error = ext4_xattr_ibody_find(inode, &i, &is);
 337         if (error)
 338                 goto out;
 339
 340         BUG_ON(is.s.not_found);
 341
 342         len -= EXT4_MIN_INLINE_DATA_SIZE;
 343         value = kzalloc(len, GFP_NOFS);
 344         if (!value) {
 345                 error = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
 350                                      value, len);
 351         if (error == -ENODATA)
 352                 goto out;
 353
 354         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 355         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 356         if (error)
 357                 goto out;
 358
 359         /* Update the xttr entry. */
 360         i.value = value;
 361         i.value_len = len;
 362
 363         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 364         if (error)
 365                 goto out;
 366
 367         EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
 368                                       (void *)ext4_raw_inode(&is.iloc));
 369         EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
 370                                 le32_to_cpu(is.s.here->e_value_size);
 371         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 372         get_bh(is.iloc.bh);
 373         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 374
 375 out:
 376         kfree(value);
 377         brelse(is.iloc.bh);
 378         return error;
 379 }
 380
 381 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
 382                                     unsigned int len)
 383 {
 384         int ret, size, no_expand;
 385         struct ext4_inode_info *ei = EXT4_I(inode);
 386
 387         if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
 388                 return -ENOSPC;
 389
 390         size = ext4_get_max_inline_size(inode);
 391         if (size < len)
 392                 return -ENOSPC;
 393
 394         ext4_write_lock_xattr(inode, &no_expand);
 395
 396         if (ei->i_inline_off)
 397                 ret = ext4_update_inline_data(handle, inode, len);
 398         else
 399                 ret = ext4_create_inline_data(handle, inode, len);
 400
 401         ext4_write_unlock_xattr(inode, &no_expand);
 402         return ret;
 403 }
 404
 405 static int ext4_destroy_inline_data_nolock(handle_t *handle,
 406                                            struct inode *inode)
 407 {
 408         struct ext4_inode_info *ei = EXT4_I(inode);
 409         struct ext4_xattr_ibody_find is = {
 410                 .s = { .not_found = 0, },
 411         };
 412         struct ext4_xattr_info i = {
 413                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
 414                 .name = EXT4_XATTR_SYSTEM_DATA,
 415                 .value = NULL,
 416                 .value_len = 0,
 417         };
 418         int error;
 419
 420         if (!ei->i_inline_off)
 421                 return 0;
 422
 423         error = ext4_get_inode_loc(inode, &is.iloc);
 424         if (error)
 425                 return error;
 426
 427         error = ext4_xattr_ibody_find(inode, &i, &is);
 428         if (error)
 429                 goto out;
 430
 431         BUFFER_TRACE(is.iloc.bh, "get_write_access");
 432         error = ext4_journal_get_write_access(handle, is.iloc.bh);
 433         if (error)
 434                 goto out;
 435
 436         error = ext4_xattr_ibody_inline_set(handle, inode, &i, &is);
 437         if (error)
 438                 goto out;
 439
 440         memset((void *)ext4_raw_inode(&is.iloc)->i_block,
 441                 0, EXT4_MIN_INLINE_DATA_SIZE);
 442
 443         if (ext4_has_feature_extents(inode->i_sb)) {
 444                 if (S_ISDIR(inode->i_mode) ||
 445                     S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
 446                         ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
 447                         ext4_ext_tree_init(handle, inode);
 448                 }
 449         }
 450         ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
 451
 452         get_bh(is.iloc.bh);
 453         error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
 454
 455         EXT4_I(inode)->i_inline_off = 0;
 456         EXT4_I(inode)->i_inline_size = 0;
 457         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 458 out:
 459         brelse(is.iloc.bh);
 460         if (error == -ENODATA)
 461                 error = 0;
 462         return error;
 463 }
 464
 465 static int ext4_read_inline_page(struct inode *inode, struct page *page)
 466 {
 467         void *kaddr;
 468         int ret = 0;
 469         size_t len;
 470         struct ext4_iloc iloc;
 471
 472         BUG_ON(!PageLocked(page));
 473         BUG_ON(!ext4_has_inline_data(inode));
 474         BUG_ON(page->index);
 475
 476         if (!EXT4_I(inode)->i_inline_off) {
 477                 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
 478                              inode->i_ino);
 479                 goto out;
 480         }
 481
 482         ret = ext4_get_inode_loc(inode, &iloc);
 483         if (ret)
 484                 goto out;
 485
 486         len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
 487         kaddr = kmap_atomic(page);
 488         ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
 489         flush_dcache_page(page);
 490         kunmap_atomic(kaddr);
 491         zero_user_segment(page, len, PAGE_SIZE);
 492         SetPageUptodate(page);
 493         brelse(iloc.bh);
 494
 495 out:
 496         return ret;
 497 }
 498
 499 int ext4_readpage_inline(struct inode *inode, struct page *page)
 500 {
 501         int ret = 0;
 502
 503         down_read(&EXT4_I(inode)->xattr_sem);
 504         if (!ext4_has_inline_data(inode)) {
 505                 up_read(&EXT4_I(inode)->xattr_sem);
 506                 return -EAGAIN;
 507         }
 508
 509         /*
 510          * Current inline data can only exist in the 1st page,
 511          * So for all the other pages, just set them uptodate.
 512          */
 513         if (!page->index)
 514                 ret = ext4_read_inline_page(inode, page);
 515         else if (!PageUptodate(page)) {
 516                 zero_user_segment(page, 0, PAGE_SIZE);
 517                 SetPageUptodate(page);
 518         }
 519
 520         up_read(&EXT4_I(inode)->xattr_sem);
 521
 522         unlock_page(page);
 523         return ret >= 0 ? 0 : ret;
 524 }
 525
 526 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
 527                                               struct inode *inode,
 528                                               unsigned flags)
 529 {
 530         int ret, needed_blocks, no_expand;
 531         handle_t *handle = NULL;
 532         int retries = 0, sem_held = 0;
 533         struct page *page = NULL;
 534         unsigned from, to;
 535         struct ext4_iloc iloc;
 536
 537         if (!ext4_has_inline_data(inode)) {
 538                 /*
 539                  * clear the flag so that no new write
 540                  * will trap here again.
 541                  */
 542                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 543                 return 0;
 544         }
 545
 546         needed_blocks = ext4_writepage_trans_blocks(inode);
 547
 548         ret = ext4_get_inode_loc(inode, &iloc);
 549         if (ret)
 550                 return ret;
 551
 552 retry:
 553         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
 554         if (IS_ERR(handle)) {
 555                 ret = PTR_ERR(handle);
 556                 handle = NULL;
 557                 goto out;
 558         }
 559
 560         /* We cannot recurse into the filesystem as the transaction is already
 561          * started */
 562         flags |= AOP_FLAG_NOFS;
 563
 564         page = grab_cache_page_write_begin(mapping, 0, flags);
 565         if (!page) {
 566                 ret = -ENOMEM;
 567                 goto out;
 568         }
 569
 570         ext4_write_lock_xattr(inode, &no_expand);
 571         sem_held = 1;
 572         /* If some one has already done this for us, just exit. */
 573         if (!ext4_has_inline_data(inode)) {
 574                 ret = 0;
 575                 goto out;
 576         }
 577
 578         from = 0;
 579         to = ext4_get_inline_size(inode);
 580         if (!PageUptodate(page)) {
 581                 ret = ext4_read_inline_page(inode, page);
 582                 if (ret < 0)
 583                         goto out;
 584         }
 585
 586         ret = ext4_destroy_inline_data_nolock(handle, inode);
 587         if (ret)
 588                 goto out;
 589
 590         if (ext4_should_dioread_nolock(inode)) {
 591                 ret = __block_write_begin(page, from, to,
 592                                           ext4_get_block_unwritten);
 593         } else
 594                 ret = __block_write_begin(page, from, to, ext4_get_block);
 595
 596         if (!ret && ext4_should_journal_data(inode)) {
 597                 ret = ext4_walk_page_buffers(handle, page_buffers(page),
 598                                              from, to, NULL,
 599                                              do_journal_get_write_access);
 600         }
 601
 602         if (ret) {
 603                 unlock_page(page);
 604                 put_page(page);
 605                 page = NULL;
 606                 ext4_orphan_add(handle, inode);
 607                 ext4_write_unlock_xattr(inode, &no_expand);
 608                 sem_held = 0;
 609                 ext4_journal_stop(handle);
 610                 handle = NULL;
 611                 ext4_truncate_failed_write(inode);
 612                 /*
 613                  * If truncate failed early the inode might
 614                  * still be on the orphan list; we need to
 615                  * make sure the inode is removed from the
 616                  * orphan list in that case.
 617                  */
 618                 if (inode->i_nlink)
 619                         ext4_orphan_del(NULL, inode);
 620         }
 621
 622         if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 623                 goto retry;
 624
 625         if (page)
 626                 block_commit_write(page, from, to);
 627 out:
 628         if (page) {
 629                 unlock_page(page);
 630                 put_page(page);
 631         }
 632         if (sem_held)
 633                 ext4_write_unlock_xattr(inode, &no_expand);
 634         if (handle)
 635                 ext4_journal_stop(handle);
 636         brelse(iloc.bh);
 637         return ret;
 638 }
 639
 640 /*
 641  * Try to write data in the inode.
 642  * If the inode has inline data, check whether the new write can be
 643  * in the inode also. If not, create the page the handle, move the data
 644  * to the page make it update and let the later codes create extent for it.
 645  */
 646 int ext4_try_to_write_inline_data(struct address_space *mapping,
 647                                   struct inode *inode,
 648                                   loff_t pos, unsigned len,
 649                                   unsigned flags,
 650                                   struct page **pagep)
 651 {
 652         int ret;
 653         handle_t *handle;
 654         struct page *page;
 655         struct ext4_iloc iloc;
 656
 657         if (pos + len > ext4_get_max_inline_size(inode))
 658                 goto convert;
 659
 660         ret = ext4_get_inode_loc(inode, &iloc);
 661         if (ret)
 662                 return ret;
 663
 664         /*
 665          * The possible write could happen in the inode,
 666          * so try to reserve the space in inode first.
 667          */
 668         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 669         if (IS_ERR(handle)) {
 670                 ret = PTR_ERR(handle);
 671                 handle = NULL;
 672                 goto out;
 673         }
 674
 675         ret = ext4_prepare_inline_data(handle, inode, pos + len);
 676         if (ret && ret != -ENOSPC)
 677                 goto out;
 678
 679         /* We don't have space in inline inode, so convert it to extent. */
 680         if (ret == -ENOSPC) {
 681                 ext4_journal_stop(handle);
 682                 brelse(iloc.bh);
 683                 goto convert;
 684         }
 685
 686         flags |= AOP_FLAG_NOFS;
 687
 688         page = grab_cache_page_write_begin(mapping, 0, flags);
 689         if (!page) {
 690                 ret = -ENOMEM;
 691                 goto out;
 692         }
 693
 694         *pagep = page;
 695         down_read(&EXT4_I(inode)->xattr_sem);
 696         if (!ext4_has_inline_data(inode)) {
 697                 ret = 0;
 698                 unlock_page(page);
 699                 put_page(page);
 700                 goto out_up_read;
 701         }
 702
 703         if (!PageUptodate(page)) {
 704                 ret = ext4_read_inline_page(inode, page);
 705                 if (ret < 0)
 706                         goto out_up_read;
 707         }
 708
 709         ret = 1;
 710         handle = NULL;
 711 out_up_read:
 712         up_read(&EXT4_I(inode)->xattr_sem);
 713 out:
 714         if (handle)
 715                 ext4_journal_stop(handle);
 716         brelse(iloc.bh);
 717         return ret;
 718 convert:
 719         return ext4_convert_inline_data_to_extent(mapping,
 720                                                   inode, flags);
 721 }
 722
 723 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
 724                                unsigned copied, struct page *page)
 725 {
 726         int ret, no_expand;
 727         void *kaddr;
 728         struct ext4_iloc iloc;
 729
 730         if (unlikely(copied < len)) {
 731                 if (!PageUptodate(page)) {
 732                         copied = 0;
 733                         goto out;
 734                 }
 735         }
 736
 737         ret = ext4_get_inode_loc(inode, &iloc);
 738         if (ret) {
 739                 ext4_std_error(inode->i_sb, ret);
 740                 copied = 0;
 741                 goto out;
 742         }
 743
 744         ext4_write_lock_xattr(inode, &no_expand);
 745         BUG_ON(!ext4_has_inline_data(inode));
 746
 747         kaddr = kmap_atomic(page);
 748         ext4_write_inline_data(inode, &iloc, kaddr, pos, len);
 749         kunmap_atomic(kaddr);
 750         SetPageUptodate(page);
 751         /* clear page dirty so that writepages wouldn't work for us. */
 752         ClearPageDirty(page);
 753
 754         ext4_write_unlock_xattr(inode, &no_expand);
 755         brelse(iloc.bh);
 756 out:
 757         return copied;
 758 }
 759
 760 struct buffer_head *
 761 ext4_journalled_write_inline_data(struct inode *inode,
 762                                   unsigned len,
 763                                   struct page *page)
 764 {
 765         int ret, no_expand;
 766         void *kaddr;
 767         struct ext4_iloc iloc;
 768
 769         ret = ext4_get_inode_loc(inode, &iloc);
 770         if (ret) {
 771                 ext4_std_error(inode->i_sb, ret);
 772                 return NULL;
 773         }
 774
 775         ext4_write_lock_xattr(inode, &no_expand);
 776         kaddr = kmap_atomic(page);
 777         ext4_write_inline_data(inode, &iloc, kaddr, 0, len);
 778         kunmap_atomic(kaddr);
 779         ext4_write_unlock_xattr(inode, &no_expand);
 780
 781         return iloc.bh;
 782 }
 783
 784 /*
 785  * Try to make the page cache and handle ready for the inline data case.
 786  * We can call this function in 2 cases:
 787  * 1. The inode is created and the first write exceeds inline size. We can
 788  *    clear the inode state safely.
 789  * 2. The inode has inline data, then we need to read the data, make it
 790  *    update and dirty so that ext4_da_writepages can handle it. We don't
 791  *    need to start the journal since the file's metatdata isn't changed now.
 792  */
 793 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
 794                                                  struct inode *inode,
 795                                                  unsigned flags,
 796                                                  void **fsdata)
 797 {
 798         int ret = 0, inline_size;
 799         struct page *page;
 800
 801         page = grab_cache_page_write_begin(mapping, 0, flags);
 802         if (!page)
 803                 return -ENOMEM;
 804
 805         down_read(&EXT4_I(inode)->xattr_sem);
 806         if (!ext4_has_inline_data(inode)) {
 807                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 808                 goto out;
 809         }
 810
 811         inline_size = ext4_get_inline_size(inode);
 812
 813         if (!PageUptodate(page)) {
 814                 ret = ext4_read_inline_page(inode, page);
 815                 if (ret < 0)
 816                         goto out;
 817         }
 818
 819         ret = __block_write_begin(page, 0, inline_size,
 820                                   ext4_da_get_block_prep);
 821         if (ret) {
 822                 up_read(&EXT4_I(inode)->xattr_sem);
 823                 unlock_page(page);
 824                 put_page(page);
 825                 ext4_truncate_failed_write(inode);
 826                 return ret;
 827         }
 828
 829         SetPageDirty(page);
 830         SetPageUptodate(page);
 831         ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
 832         *fsdata = (void *)CONVERT_INLINE_DATA;
 833
 834 out:
 835         up_read(&EXT4_I(inode)->xattr_sem);
 836         if (page) {
 837                 unlock_page(page);
 838                 put_page(page);
 839         }
 840         return ret;
 841 }
 842
 843 /*
 844  * Prepare the write for the inline data.
 845  * If the the data can be written into the inode, we just read
 846  * the page and make it uptodate, and start the journal.
 847  * Otherwise read the page, makes it dirty so that it can be
 848  * handle in writepages(the i_disksize update is left to the
 849  * normal ext4_da_write_end).
 850  */
 851 int ext4_da_write_inline_data_begin(struct address_space *mapping,
 852                                     struct inode *inode,
 853                                     loff_t pos, unsigned len,
 854                                     unsigned flags,
 855                                     struct page **pagep,
 856                                     void **fsdata)
 857 {
 858         int ret, inline_size;
 859         handle_t *handle;
 860         struct page *page;
 861         struct ext4_iloc iloc;
 862         int retries;
 863
 864         ret = ext4_get_inode_loc(inode, &iloc);
 865         if (ret)
 866                 return ret;
 867
 868 retry_journal:
 869         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 870         if (IS_ERR(handle)) {
 871                 ret = PTR_ERR(handle);
 872                 goto out;
 873         }
 874
 875         inline_size = ext4_get_max_inline_size(inode);
 876
 877         ret = -ENOSPC;
 878         if (inline_size >= pos + len) {
 879                 ret = ext4_prepare_inline_data(handle, inode, pos + len);
 880                 if (ret && ret != -ENOSPC)
 881                         goto out_journal;
 882         }
 883
 884         /*
 885          * We cannot recurse into the filesystem as the transaction
 886          * is already started.
 887          */
 888         flags |= AOP_FLAG_NOFS;
 889
 890         if (ret == -ENOSPC) {
 891                 ret = ext4_da_convert_inline_data_to_extent(mapping,
 892                                                             inode,
 893                                                             flags,
 894                                                             fsdata);
 895                 ext4_journal_stop(handle);
 896                 if (ret == -ENOSPC &&
 897                     ext4_should_retry_alloc(inode->i_sb, &retries))
 898                         goto retry_journal;
 899                 goto out;
 900         }
 901
 902
 903         page = grab_cache_page_write_begin(mapping, 0, flags);
 904         if (!page) {
 905                 ret = -ENOMEM;
 906                 goto out_journal;
 907         }
 908
 909         down_read(&EXT4_I(inode)->xattr_sem);
 910         if (!ext4_has_inline_data(inode)) {
 911                 ret = 0;
 912                 goto out_release_page;
 913         }
 914
 915         if (!PageUptodate(page)) {
 916                 ret = ext4_read_inline_page(inode, page);
 917                 if (ret < 0)
 918                         goto out_release_page;
 919         }
 920
 921         up_read(&EXT4_I(inode)->xattr_sem);
 922         *pagep = page;
 923         brelse(iloc.bh);
 924         return 1;
 925 out_release_page:
 926         up_read(&EXT4_I(inode)->xattr_sem);
 927         unlock_page(page);
 928         put_page(page);
 929 out_journal:
 930         ext4_journal_stop(handle);
 931 out:
 932         brelse(iloc.bh);
 933         return ret;
 934 }
 935
 936 int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
 937                                   unsigned len, unsigned copied,
 938                                   struct page *page)
 939 {
 940         int i_size_changed = 0;
 941         int ret;
 942
 943         ret = ext4_write_inline_data_end(inode, pos, len, copied, page);
 944         if (ret < 0) {
 945                 unlock_page(page);
 946                 put_page(page);
 947                 return ret;
 948         }
 949         copied = ret;
 950
 951         /*
 952          * No need to use i_size_read() here, the i_size
 953          * cannot change under us because we hold i_mutex.
 954          *
 955          * But it's important to update i_size while still holding page lock:
 956          * page writeout could otherwise come in and zero beyond i_size.
 957          */
 958         if (pos+copied > inode->i_size) {
 959                 i_size_write(inode, pos+copied);
 960                 i_size_changed = 1;
 961         }
 962         unlock_page(page);
 963         put_page(page);
 964
 965         /*
 966          * Don't mark the inode dirty under page lock. First, it unnecessarily
 967          * makes the holding time of page lock longer. Second, it forces lock
 968          * ordering of page lock and transaction start for journaling
 969          * filesystems.
 970          */
 971         if (i_size_changed)
 972                 mark_inode_dirty(inode);
 973
 974         return copied;
 975 }
 976
 977 #ifdef INLINE_DIR_DEBUG
 978 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
 979                           void *inline_start, int inline_size)
 980 {
 981         int offset;
 982         unsigned short de_len;
 983         struct ext4_dir_entry_2 *de = inline_start;
 984         void *dlimit = inline_start + inline_size;
 985
 986         trace_printk("inode %lu\n", dir->i_ino);
 987         offset = 0;
 988         while ((void *)de < dlimit) {
 989                 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
 990                 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
 991                              offset, de_len, de->name_len, de->name,
 992                              de->name_len, le32_to_cpu(de->inode));
 993                 if (ext4_check_dir_entry(dir, NULL, de, bh,
 994                                          inline_start, inline_size, offset))
 995                         BUG();
 996
 997                 offset += de_len;
 998                 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
 999         }
1000 }
1001 #else
1002 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
1003 #endif
1004
1005 /*
1006  * Add a new entry into a inline dir.
1007  * It will return -ENOSPC if no space is available, and -EIO
1008  * and -EEXIST if directory entry already exists.
1009  */
1010 static int ext4_add_dirent_to_inline(handle_t *handle,
1011                                      struct ext4_filename *fname,
1012                                      struct inode *dir,
1013                                      struct inode *inode,
1014                                      struct ext4_iloc *iloc,
1015                                      void *inline_start, int inline_size)
1016 {
1017         int             err;
1018         struct ext4_dir_entry_2 *de;
1019
1020         err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start,
1021                                 inline_size, fname, &de);
1022         if (err)
1023                 return err;
1024
1025         BUFFER_TRACE(iloc->bh, "get_write_access");
1026         err = ext4_journal_get_write_access(handle, iloc->bh);
1027         if (err)
1028                 return err;
1029         ext4_insert_dentry(inode, de, inline_size, fname);
1030
1031         ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
1032
1033         /*
1034          * XXX shouldn't update any times until successful
1035          * completion of syscall, but too many callers depend
1036          * on this.
1037          *
1038          * XXX similarly, too many callers depend on
1039          * ext4_new_inode() setting the times, but error
1040          * recovery deletes the inode, so the worst that can
1041          * happen is that the times are slightly out of date
1042          * and/or different from the directory change time.
1043          */
1044         dir->i_mtime = dir->i_ctime = current_time(dir);
1045         ext4_update_dx_flag(dir);
1046         inode_inc_iversion(dir);
1047         return 1;
1048 }
1049
1050 static void *ext4_get_inline_xattr_pos(struct inode *inode,
1051                                        struct ext4_iloc *iloc)
1052 {
1053         struct ext4_xattr_entry *entry;
1054         struct ext4_xattr_ibody_header *header;
1055
1056         BUG_ON(!EXT4_I(inode)->i_inline_off);
1057
1058         header = IHDR(inode, ext4_raw_inode(iloc));
1059         entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
1060                                             EXT4_I(inode)->i_inline_off);
1061
1062         return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
1063 }
1064
1065 /* Set the final de to cover the whole block. */
1066 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
1067 {
1068         struct ext4_dir_entry_2 *de, *prev_de;
1069         void *limit;
1070         int de_len;
1071
1072         de = (struct ext4_dir_entry_2 *)de_buf;
1073         if (old_size) {
1074                 limit = de_buf + old_size;
1075                 do {
1076                         prev_de = de;
1077                         de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1078                         de_buf += de_len;
1079                         de = (struct ext4_dir_entry_2 *)de_buf;
1080                 } while (de_buf < limit);
1081
1082                 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1083                                                         old_size, new_size);
1084         } else {
1085                 /* this is just created, so create an empty entry. */
1086                 de->inode = 0;
1087                 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1088         }
1089 }
1090
1091 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1092                                   struct ext4_iloc *iloc)
1093 {
1094         int ret;
1095         int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1096         int new_size = get_max_inline_xattr_value_size(dir, iloc);
1097
1098         if (new_size - old_size <= EXT4_DIR_REC_LEN(1))
1099                 return -ENOSPC;
1100
1101         ret = ext4_update_inline_data(handle, dir,
1102                                       new_size + EXT4_MIN_INLINE_DATA_SIZE);
1103         if (ret)
1104                 return ret;
1105
1106         ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1107                              EXT4_I(dir)->i_inline_size -
1108                                                 EXT4_MIN_INLINE_DATA_SIZE);
1109         dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1110         return 0;
1111 }
1112
1113 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1114                                      struct ext4_iloc *iloc,
1115                                      void *buf, int inline_size)
1116 {
1117         ext4_create_inline_data(handle, inode, inline_size);
1118         ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1119         ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1120 }
1121
1122 static int ext4_finish_convert_inline_dir(handle_t *handle,
1123                                           struct inode *inode,
1124                                           struct buffer_head *dir_block,
1125                                           void *buf,
1126                                           int inline_size)
1127 {
1128         int err, csum_size = 0, header_size = 0;
1129         struct ext4_dir_entry_2 *de;
1130         struct ext4_dir_entry_tail *t;
1131         void *target = dir_block->b_data;
1132
1133         /*
1134          * First create "." and ".." and then copy the dir information
1135          * back to the block.
1136          */
1137         de = (struct ext4_dir_entry_2 *)target;
1138         de = ext4_init_dot_dotdot(inode, de,
1139                 inode->i_sb->s_blocksize, csum_size,
1140                 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1141         header_size = (void *)de - target;
1142
1143         memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1144                 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1145
1146         if (ext4_has_metadata_csum(inode->i_sb))
1147                 csum_size = sizeof(struct ext4_dir_entry_tail);
1148
1149         inode->i_size = inode->i_sb->s_blocksize;
1150         i_size_write(inode, inode->i_sb->s_blocksize);
1151         EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1152         ext4_update_final_de(dir_block->b_data,
1153                         inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1154                         inode->i_sb->s_blocksize - csum_size);
1155
1156         if (csum_size) {
1157                 t = EXT4_DIRENT_TAIL(dir_block->b_data,
1158                                      inode->i_sb->s_blocksize);
1159                 initialize_dirent_tail(t, inode->i_sb->s_blocksize);
1160         }
1161         set_buffer_uptodate(dir_block);
1162         err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
1163         if (err)
1164                 return err;
1165         set_buffer_verified(dir_block);
1166         return ext4_mark_inode_dirty(handle, inode);
1167 }
1168
1169 static int ext4_convert_inline_data_nolock(handle_t *handle,
1170                                            struct inode *inode,
1171                                            struct ext4_iloc *iloc)
1172 {
1173         int error;
1174         void *buf = NULL;
1175         struct buffer_head *data_bh = NULL;
1176         struct ext4_map_blocks map;
1177         int inline_size;
1178
1179         inline_size = ext4_get_inline_size(inode);
1180         buf = kmalloc(inline_size, GFP_NOFS);
1181         if (!buf) {
1182                 error = -ENOMEM;
1183                 goto out;
1184         }
1185
1186         error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1187         if (error < 0)
1188                 goto out;
1189
1190         /*
1191          * Make sure the inline directory entries pass checks before we try to
1192          * convert them, so that we avoid touching stuff that needs fsck.
1193          */
1194         if (S_ISDIR(inode->i_mode)) {
1195                 error = ext4_check_all_de(inode, iloc->bh,
1196                                         buf + EXT4_INLINE_DOTDOT_SIZE,
1197                                         inline_size - EXT4_INLINE_DOTDOT_SIZE);
1198                 if (error)
1199                         goto out;
1200         }
1201
1202         error = ext4_destroy_inline_data_nolock(handle, inode);
1203         if (error)
1204                 goto out;
1205
1206         map.m_lblk = 0;
1207         map.m_len = 1;
1208         map.m_flags = 0;
1209         error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1210         if (error < 0)
1211                 goto out_restore;
1212         if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1213                 error = -EIO;
1214                 goto out_restore;
1215         }
1216
1217         data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1218         if (!data_bh) {
1219                 error = -ENOMEM;
1220                 goto out_restore;
1221         }
1222
1223         lock_buffer(data_bh);
1224         error = ext4_journal_get_create_access(handle, data_bh);
1225         if (error) {
1226                 unlock_buffer(data_bh);
1227                 error = -EIO;
1228                 goto out_restore;
1229         }
1230         memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1231
1232         if (!S_ISDIR(inode->i_mode)) {
1233                 memcpy(data_bh->b_data, buf, inline_size);
1234                 set_buffer_uptodate(data_bh);
1235                 error = ext4_handle_dirty_metadata(handle,
1236                                                    inode, data_bh);
1237         } else {
1238                 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1239                                                        buf, inline_size);
1240         }
1241
1242         unlock_buffer(data_bh);
1243 out_restore:
1244         if (error)
1245                 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1246
1247 out:
1248         brelse(data_bh);
1249         kfree(buf);
1250         return error;
1251 }
1252
1253 /*
1254  * Try to add the new entry to the inline data.
1255  * If succeeds, return 0. If not, extended the inline dir and copied data to
1256  * the new created block.
1257  */
1258 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1259                               struct inode *dir, struct inode *inode)
1260 {
1261         int ret, inline_size, no_expand;
1262         void *inline_start;
1263         struct ext4_iloc iloc;
1264
1265         ret = ext4_get_inode_loc(dir, &iloc);
1266         if (ret)
1267                 return ret;
1268
1269         ext4_write_lock_xattr(dir, &no_expand);
1270         if (!ext4_has_inline_data(dir))
1271                 goto out;
1272
1273         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1274                                                  EXT4_INLINE_DOTDOT_SIZE;
1275         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1276
1277         ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1278                                         inline_start, inline_size);
1279         if (ret != -ENOSPC)
1280                 goto out;
1281
1282         /* check whether it can be inserted to inline xattr space. */
1283         inline_size = EXT4_I(dir)->i_inline_size -
1284                         EXT4_MIN_INLINE_DATA_SIZE;
1285         if (!inline_size) {
1286                 /* Try to use the xattr space.*/
1287                 ret = ext4_update_inline_dir(handle, dir, &iloc);
1288                 if (ret && ret != -ENOSPC)
1289                         goto out;
1290
1291                 inline_size = EXT4_I(dir)->i_inline_size -
1292                                 EXT4_MIN_INLINE_DATA_SIZE;
1293         }
1294
1295         if (inline_size) {
1296                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1297
1298                 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1299                                                 inode, &iloc, inline_start,
1300                                                 inline_size);
1301
1302                 if (ret != -ENOSPC)
1303                         goto out;
1304         }
1305
1306         /*
1307          * The inline space is filled up, so create a new block for it.
1308          * As the extent tree will be created, we have to save the inline
1309          * dir first.
1310          */
1311         ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1312
1313 out:
1314         ext4_write_unlock_xattr(dir, &no_expand);
1315         ext4_mark_inode_dirty(handle, dir);
1316         brelse(iloc.bh);
1317         return ret;
1318 }
1319
1320 /*
1321  * This function fills a red-black tree with information from an
1322  * inlined dir.  It returns the number directory entries loaded
1323  * into the tree.  If there is an error it is returned in err.
1324  */
1325 int htree_inlinedir_to_tree(struct file *dir_file,
1326                             struct inode *dir, ext4_lblk_t block,
1327                             struct dx_hash_info *hinfo,
1328                             __u32 start_hash, __u32 start_minor_hash,
1329                             int *has_inline_data)
1330 {
1331         int err = 0, count = 0;
1332         unsigned int parent_ino;
1333         int pos;
1334         struct ext4_dir_entry_2 *de;
1335         struct inode *inode = file_inode(dir_file);
1336         int ret, inline_size = 0;
1337         struct ext4_iloc iloc;
1338         void *dir_buf = NULL;
1339         struct ext4_dir_entry_2 fake;
1340         struct fscrypt_str tmp_str;
1341
1342         ret = ext4_get_inode_loc(inode, &iloc);
1343         if (ret)
1344                 return ret;
1345
1346         down_read(&EXT4_I(inode)->xattr_sem);
1347         if (!ext4_has_inline_data(inode)) {
1348                 up_read(&EXT4_I(inode)->xattr_sem);
1349                 *has_inline_data = 0;
1350                 goto out;
1351         }
1352
1353         inline_size = ext4_get_inline_size(inode);
1354         dir_buf = kmalloc(inline_size, GFP_NOFS);
1355         if (!dir_buf) {
1356                 ret = -ENOMEM;
1357                 up_read(&EXT4_I(inode)->xattr_sem);
1358                 goto out;
1359         }
1360
1361         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1362         up_read(&EXT4_I(inode)->xattr_sem);
1363         if (ret < 0)
1364                 goto out;
1365
1366         pos = 0;
1367         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1368         while (pos < inline_size) {
1369                 /*
1370                  * As inlined dir doesn't store any information about '.' and
1371                  * only the inode number of '..' is stored, we have to handle
1372                  * them differently.
1373                  */
1374                 if (pos == 0) {
1375                         fake.inode = cpu_to_le32(inode->i_ino);
1376                         fake.name_len = 1;
1377                         strcpy(fake.name, ".");
1378                         fake.rec_len = ext4_rec_len_to_disk(
1379                                                 EXT4_DIR_REC_LEN(fake.name_len),
1380                                                 inline_size);
1381                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1382                         de = &fake;
1383                         pos = EXT4_INLINE_DOTDOT_OFFSET;
1384                 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1385                         fake.inode = cpu_to_le32(parent_ino);
1386                         fake.name_len = 2;
1387                         strcpy(fake.name, "..");
1388                         fake.rec_len = ext4_rec_len_to_disk(
1389                                                 EXT4_DIR_REC_LEN(fake.name_len),
1390                                                 inline_size);
1391                         ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1392                         de = &fake;
1393                         pos = EXT4_INLINE_DOTDOT_SIZE;
1394                 } else {
1395                         de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1396                         pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1397                         if (ext4_check_dir_entry(inode, dir_file, de,
1398                                          iloc.bh, dir_buf,
1399                                          inline_size, pos)) {
1400                                 ret = count;
1401                                 goto out;
1402                         }
1403                 }
1404
1405                 ext4fs_dirhash(de->name, de->name_len, hinfo);
1406                 if ((hinfo->hash < start_hash) ||
1407                     ((hinfo->hash == start_hash) &&
1408                      (hinfo->minor_hash < start_minor_hash)))
1409                         continue;
1410                 if (de->inode == 0)
1411                         continue;
1412                 tmp_str.name = de->name;
1413                 tmp_str.len = de->name_len;
1414                 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1415                                               hinfo->minor_hash, de, &tmp_str);
1416                 if (err) {
1417                         count = err;
1418                         goto out;
1419                 }
1420                 count++;
1421         }
1422         ret = count;
1423 out:
1424         kfree(dir_buf);
1425         brelse(iloc.bh);
1426         return ret;
1427 }
1428
1429 /*
1430  * So this function is called when the volume is mkfsed with
1431  * dir_index disabled. In order to keep f_pos persistent
1432  * after we convert from an inlined dir to a blocked based,
1433  * we just pretend that we are a normal dir and return the
1434  * offset as if '.' and '..' really take place.
1435  *
1436  */
1437 int ext4_read_inline_dir(struct file *file,
1438                          struct dir_context *ctx,
1439                          int *has_inline_data)
1440 {
1441         unsigned int offset, parent_ino;
1442         int i;
1443         struct ext4_dir_entry_2 *de;
1444         struct super_block *sb;
1445         struct inode *inode = file_inode(file);
1446         int ret, inline_size = 0;
1447         struct ext4_iloc iloc;
1448         void *dir_buf = NULL;
1449         int dotdot_offset, dotdot_size, extra_offset, extra_size;
1450
1451         ret = ext4_get_inode_loc(inode, &iloc);
1452         if (ret)
1453                 return ret;
1454
1455         down_read(&EXT4_I(inode)->xattr_sem);
1456         if (!ext4_has_inline_data(inode)) {
1457                 up_read(&EXT4_I(inode)->xattr_sem);
1458                 *has_inline_data = 0;
1459                 goto out;
1460         }
1461
1462         inline_size = ext4_get_inline_size(inode);
1463         dir_buf = kmalloc(inline_size, GFP_NOFS);
1464         if (!dir_buf) {
1465                 ret = -ENOMEM;
1466                 up_read(&EXT4_I(inode)->xattr_sem);
1467                 goto out;
1468         }
1469
1470         ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1471         up_read(&EXT4_I(inode)->xattr_sem);
1472         if (ret < 0)
1473                 goto out;
1474
1475         ret = 0;
1476         sb = inode->i_sb;
1477         parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1478         offset = ctx->pos;
1479
1480         /*
1481          * dotdot_offset and dotdot_size is the real offset and
1482          * size for ".." and "." if the dir is block based while
1483          * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1484          * So we will use extra_offset and extra_size to indicate them
1485          * during the inline dir iteration.
1486          */
1487         dotdot_offset = EXT4_DIR_REC_LEN(1);
1488         dotdot_size = dotdot_offset + EXT4_DIR_REC_LEN(2);
1489         extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1490         extra_size = extra_offset + inline_size;
1491
1492         /*
1493          * If the version has changed since the last call to
1494          * readdir(2), then we might be pointing to an invalid
1495          * dirent right now.  Scan from the start of the inline
1496          * dir to make sure.
1497          */
1498         if (inode_cmp_iversion(inode, file->f_version)) {
1499                 for (i = 0; i < extra_size && i < offset;) {
1500                         /*
1501                          * "." is with offset 0 and
1502                          * ".." is dotdot_offset.
1503                          */
1504                         if (!i) {
1505                                 i = dotdot_offset;
1506                                 continue;
1507                         } else if (i == dotdot_offset) {
1508                                 i = dotdot_size;
1509                                 continue;
1510                         }
1511                         /* for other entry, the real offset in
1512                          * the buf has to be tuned accordingly.
1513                          */
1514                         de = (struct ext4_dir_entry_2 *)
1515                                 (dir_buf + i - extra_offset);
1516                         /* It's too expensive to do a full
1517                          * dirent test each time round this
1518                          * loop, but we do have to test at
1519                          * least that it is non-zero.  A
1520                          * failure will be detected in the
1521                          * dirent test below. */
1522                         if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1523                                 < EXT4_DIR_REC_LEN(1))
1524                                 break;
1525                         i += ext4_rec_len_from_disk(de->rec_len,
1526                                                     extra_size);
1527                 }
1528                 offset = i;
1529                 ctx->pos = offset;
1530                 file->f_version = inode_query_iversion(inode);
1531         }
1532
1533         while (ctx->pos < extra_size) {
1534                 if (ctx->pos == 0) {
1535                         if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1536                                 goto out;
1537                         ctx->pos = dotdot_offset;
1538                         continue;
1539                 }
1540
1541                 if (ctx->pos == dotdot_offset) {
1542                         if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1543                                 goto out;
1544                         ctx->pos = dotdot_size;
1545                         continue;
1546                 }
1547
1548                 de = (struct ext4_dir_entry_2 *)
1549                         (dir_buf + ctx->pos - extra_offset);
1550                 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1551                                          extra_size, ctx->pos))
1552                         goto out;
1553                 if (le32_to_cpu(de->inode)) {
1554                         if (!dir_emit(ctx, de->name, de->name_len,
1555                                       le32_to_cpu(de->inode),
1556                                       get_dtype(sb, de->file_type)))
1557                                 goto out;
1558                 }
1559                 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1560         }
1561 out:
1562         kfree(dir_buf);
1563         brelse(iloc.bh);
1564         return ret;
1565 }
1566
1567 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1568                                         struct ext4_dir_entry_2 **parent_de,
1569                                         int *retval)
1570 {
1571         struct ext4_iloc iloc;
1572
1573         *retval = ext4_get_inode_loc(inode, &iloc);
1574         if (*retval)
1575                 return NULL;
1576
1577         *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1578
1579         return iloc.bh;
1580 }
1581
1582 /*
1583  * Try to create the inline data for the new dir.
1584  * If it succeeds, return 0, otherwise return the error.
1585  * In case of ENOSPC, the caller should create the normal disk layout dir.
1586  */
1587 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1588                                struct inode *inode)
1589 {
1590         int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1591         struct ext4_iloc iloc;
1592         struct ext4_dir_entry_2 *de;
1593
1594         ret = ext4_get_inode_loc(inode, &iloc);
1595         if (ret)
1596                 return ret;
1597
1598         ret = ext4_prepare_inline_data(handle, inode, inline_size);
1599         if (ret)
1600                 goto out;
1601
1602         /*
1603          * For inline dir, we only save the inode information for the ".."
1604          * and create a fake dentry to cover the left space.
1605          */
1606         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1607         de->inode = cpu_to_le32(parent->i_ino);
1608         de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1609         de->inode = 0;
1610         de->rec_len = ext4_rec_len_to_disk(
1611                                 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1612                                 inline_size);
1613         set_nlink(inode, 2);
1614         inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1615 out:
1616         brelse(iloc.bh);
1617         return ret;
1618 }
1619
1620 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1621                                         struct ext4_filename *fname,
1622                                         struct ext4_dir_entry_2 **res_dir,
1623                                         int *has_inline_data)
1624 {
1625         int ret;
1626         struct ext4_iloc iloc;
1627         void *inline_start;
1628         int inline_size;
1629
1630         if (ext4_get_inode_loc(dir, &iloc))
1631                 return NULL;
1632
1633         down_read(&EXT4_I(dir)->xattr_sem);
1634         if (!ext4_has_inline_data(dir)) {
1635                 *has_inline_data = 0;
1636                 goto out;
1637         }
1638
1639         inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1640                                                 EXT4_INLINE_DOTDOT_SIZE;
1641         inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1642         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1643                               dir, fname, 0, res_dir);
1644         if (ret == 1)
1645                 goto out_find;
1646         if (ret < 0)
1647                 goto out;
1648
1649         if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1650                 goto out;
1651
1652         inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1653         inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1654
1655         ret = ext4_search_dir(iloc.bh, inline_start, inline_size,
1656                               dir, fname, 0, res_dir);
1657         if (ret == 1)
1658                 goto out_find;
1659
1660 out:
1661         brelse(iloc.bh);
1662         iloc.bh = NULL;
1663 out_find:
1664         up_read(&EXT4_I(dir)->xattr_sem);
1665         return iloc.bh;
1666 }
1667
1668 int ext4_delete_inline_entry(handle_t *handle,
1669                              struct inode *dir,
1670                              struct ext4_dir_entry_2 *de_del,
1671                              struct buffer_head *bh,
1672                              int *has_inline_data)
1673 {
1674         int err, inline_size, no_expand;
1675         struct ext4_iloc iloc;
1676         void *inline_start;
1677
1678         err = ext4_get_inode_loc(dir, &iloc);
1679         if (err)
1680                 return err;
1681
1682         ext4_write_lock_xattr(dir, &no_expand);
1683         if (!ext4_has_inline_data(dir)) {
1684                 *has_inline_data = 0;
1685                 goto out;
1686         }
1687
1688         if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1689                 EXT4_MIN_INLINE_DATA_SIZE) {
1690                 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1691                                         EXT4_INLINE_DOTDOT_SIZE;
1692                 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1693                                 EXT4_INLINE_DOTDOT_SIZE;
1694         } else {
1695                 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1696                 inline_size = ext4_get_inline_size(dir) -
1697                                 EXT4_MIN_INLINE_DATA_SIZE;
1698         }
1699
1700         BUFFER_TRACE(bh, "get_write_access");
1701         err = ext4_journal_get_write_access(handle, bh);
1702         if (err)
1703                 goto out;
1704
1705         err = ext4_generic_delete_entry(handle, dir, de_del, bh,
1706                                         inline_start, inline_size, 0);
1707         if (err)
1708                 goto out;
1709
1710         ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1711 out:
1712         ext4_write_unlock_xattr(dir, &no_expand);
1713         if (likely(err == 0))
1714                 err = ext4_mark_inode_dirty(handle, dir);
1715         brelse(iloc.bh);
1716         if (err != -ENOENT)
1717                 ext4_std_error(dir->i_sb, err);
1718         return err;
1719 }
1720
1721 /*
1722  * Get the inline dentry at offset.
1723  */
1724 static inline struct ext4_dir_entry_2 *
1725 ext4_get_inline_entry(struct inode *inode,
1726                       struct ext4_iloc *iloc,
1727                       unsigned int offset,
1728                       void **inline_start,
1729                       int *inline_size)
1730 {
1731         void *inline_pos;
1732
1733         BUG_ON(offset > ext4_get_inline_size(inode));
1734
1735         if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1736                 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1737                 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1738         } else {
1739                 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1740                 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1741                 *inline_size = ext4_get_inline_size(inode) -
1742                                 EXT4_MIN_INLINE_DATA_SIZE;
1743         }
1744
1745         if (inline_start)
1746                 *inline_start = inline_pos;
1747         return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1748 }
1749
1750 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1751 {
1752         int err, inline_size;
1753         struct ext4_iloc iloc;
1754         void *inline_pos;
1755         unsigned int offset;
1756         struct ext4_dir_entry_2 *de;
1757         bool ret = true;
1758
1759         err = ext4_get_inode_loc(dir, &iloc);
1760         if (err) {
1761                 EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
1762                                  err, dir->i_ino);
1763                 return true;
1764         }
1765
1766         down_read(&EXT4_I(dir)->xattr_sem);
1767         if (!ext4_has_inline_data(dir)) {
1768                 *has_inline_data = 0;
1769                 goto out;
1770         }
1771
1772         de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1773         if (!le32_to_cpu(de->inode)) {
1774                 ext4_warning(dir->i_sb,
1775                              "bad inline directory (dir #%lu) - no `..'",
1776                              dir->i_ino);
1777                 ret = true;
1778                 goto out;
1779         }
1780
1781         offset = EXT4_INLINE_DOTDOT_SIZE;
1782         while (offset < dir->i_size) {
1783                 de = ext4_get_inline_entry(dir, &iloc, offset,
1784                                            &inline_pos, &inline_size);
1785                 if (ext4_check_dir_entry(dir, NULL, de,
1786                                          iloc.bh, inline_pos,
1787                                          inline_size, offset)) {
1788                         ext4_warning(dir->i_sb,
1789                                      "bad inline directory (dir #%lu) - "
1790                                      "inode %u, rec_len %u, name_len %d"
1791                                      "inline size %d",
1792                                      dir->i_ino, le32_to_cpu(de->inode),
1793                                      le16_to_cpu(de->rec_len), de->name_len,
1794                                      inline_size);
1795                         ret = true;
1796                         goto out;
1797                 }
1798                 if (le32_to_cpu(de->inode)) {
1799                         ret = false;
1800                         goto out;
1801                 }
1802                 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1803         }
1804
1805 out:
1806         up_read(&EXT4_I(dir)->xattr_sem);
1807         brelse(iloc.bh);
1808         return ret;
1809 }
1810
1811 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1812 {
1813         int ret, no_expand;
1814
1815         ext4_write_lock_xattr(inode, &no_expand);
1816         ret = ext4_destroy_inline_data_nolock(handle, inode);
1817         ext4_write_unlock_xattr(inode, &no_expand);
1818
1819         return ret;
1820 }
1821
1822 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1823 {
1824         __u64 addr;
1825         int error = -EAGAIN;
1826         struct ext4_iloc iloc;
1827
1828         down_read(&EXT4_I(inode)->xattr_sem);
1829         if (!ext4_has_inline_data(inode))
1830                 goto out;
1831
1832         error = ext4_get_inode_loc(inode, &iloc);
1833         if (error)
1834                 goto out;
1835
1836         addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1837         addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1838         addr += offsetof(struct ext4_inode, i_block);
1839
1840         brelse(iloc.bh);
1841
1842         iomap->addr = addr;
1843         iomap->offset = 0;
1844         iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1845                               i_size_read(inode));
1846         iomap->type = 0;
1847         iomap->flags = IOMAP_F_DATA_INLINE;
1848
1849 out:
1850         up_read(&EXT4_I(inode)->xattr_sem);
1851         return error;
1852 }
1853
1854 int ext4_inline_data_fiemap(struct inode *inode,
1855                             struct fiemap_extent_info *fieinfo,
1856                             int *has_inline, __u64 start, __u64 len)
1857 {
1858         __u64 physical = 0;
1859         __u64 inline_len;
1860         __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED |
1861                 FIEMAP_EXTENT_LAST;
1862         int error = 0;
1863         struct ext4_iloc iloc;
1864
1865         down_read(&EXT4_I(inode)->xattr_sem);
1866         if (!ext4_has_inline_data(inode)) {
1867                 *has_inline = 0;
1868                 goto out;
1869         }
1870         inline_len = min_t(size_t, ext4_get_inline_size(inode),
1871                            i_size_read(inode));
1872         if (start >= inline_len)
1873                 goto out;
1874         if (start + len < inline_len)
1875                 inline_len = start + len;
1876         inline_len -= start;
1877
1878         error = ext4_get_inode_loc(inode, &iloc);
1879         if (error)
1880                 goto out;
1881
1882         physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1883         physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1884         physical += offsetof(struct ext4_inode, i_block);
1885
1886         if (physical)
1887                 error = fiemap_fill_next_extent(fieinfo, start, physical,
1888                                                 inline_len, flags);
1889         brelse(iloc.bh);
1890 out:
1891         up_read(&EXT4_I(inode)->xattr_sem);
1892         return (error < 0 ? error : 0);
1893 }
1894
1895 /*
1896  * Called during xattr set, and if we can sparse space 'needed',
1897  * just create the extent tree evict the data to the outer block.
1898  *
1899  * We use jbd2 instead of page cache to move data to the 1st block
1900  * so that the whole transaction can be committed as a whole and
1901  * the data isn't lost because of the delayed page cache write.
1902  */
1903 int ext4_try_to_evict_inline_data(handle_t *handle,
1904                                   struct inode *inode,
1905                                   int needed)
1906 {
1907         int error;
1908         struct ext4_xattr_entry *entry;
1909         struct ext4_inode *raw_inode;
1910         struct ext4_iloc iloc;
1911
1912         error = ext4_get_inode_loc(inode, &iloc);
1913         if (error)
1914                 return error;
1915
1916         raw_inode = ext4_raw_inode(&iloc);
1917         entry = (struct ext4_xattr_entry *)((void *)raw_inode +
1918                                             EXT4_I(inode)->i_inline_off);
1919         if (EXT4_XATTR_LEN(entry->e_name_len) +
1920             EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
1921                 error = -ENOSPC;
1922                 goto out;
1923         }
1924
1925         error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1926 out:
1927         brelse(iloc.bh);
1928         return error;
1929 }
1930
1931 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1932 {
1933         handle_t *handle;
1934         int inline_size, value_len, needed_blocks, no_expand, err = 0;
1935         size_t i_size;
1936         void *value = NULL;
1937         struct ext4_xattr_ibody_find is = {
1938                 .s = { .not_found = -ENODATA, },
1939         };
1940         struct ext4_xattr_info i = {
1941                 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1942                 .name = EXT4_XATTR_SYSTEM_DATA,
1943         };
1944
1945
1946         needed_blocks = ext4_writepage_trans_blocks(inode);
1947         handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1948         if (IS_ERR(handle))
1949                 return PTR_ERR(handle);
1950
1951         ext4_write_lock_xattr(inode, &no_expand);
1952         if (!ext4_has_inline_data(inode)) {
1953                 *has_inline = 0;
1954                 ext4_journal_stop(handle);
1955                 return 0;
1956         }
1957
1958         if ((err = ext4_orphan_add(handle, inode)) != 0)
1959                 goto out;
1960
1961         if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1962                 goto out;
1963
1964         down_write(&EXT4_I(inode)->i_data_sem);
1965         i_size = inode->i_size;
1966         inline_size = ext4_get_inline_size(inode);
1967         EXT4_I(inode)->i_disksize = i_size;
1968
1969         if (i_size < inline_size) {
1970                 /* Clear the content in the xattr space. */
1971                 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1972                         if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1973                                 goto out_error;
1974
1975                         BUG_ON(is.s.not_found);
1976
1977                         value_len = le32_to_cpu(is.s.here->e_value_size);
1978                         value = kmalloc(value_len, GFP_NOFS);
1979                         if (!value) {
1980                                 err = -ENOMEM;
1981                                 goto out_error;
1982                         }
1983
1984                         err = ext4_xattr_ibody_get(inode, i.name_index,
1985                                                    i.name, value, value_len);
1986                         if (err <= 0)
1987                                 goto out_error;
1988
1989                         i.value = value;
1990                         i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1991                                         i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1992                         err = ext4_xattr_ibody_inline_set(handle, inode,
1993                                                           &i, &is);
1994                         if (err)
1995                                 goto out_error;
1996                 }
1997
1998                 /* Clear the content within i_blocks. */
1999                 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
2000                         void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
2001                         memset(p + i_size, 0,
2002                                EXT4_MIN_INLINE_DATA_SIZE - i_size);
2003                 }
2004
2005                 EXT4_I(inode)->i_inline_size = i_size <
2006                                         EXT4_MIN_INLINE_DATA_SIZE ?
2007                                         EXT4_MIN_INLINE_DATA_SIZE : i_size;
2008         }
2009
2010 out_error:
2011         up_write(&EXT4_I(inode)->i_data_sem);
2012 out:
2013         brelse(is.iloc.bh);
2014         ext4_write_unlock_xattr(inode, &no_expand);
2015         kfree(value);
2016         if (inode->i_nlink)
2017                 ext4_orphan_del(handle, inode);
2018
2019         if (err == 0) {
2020                 inode->i_mtime = inode->i_ctime = current_time(inode);
2021                 err = ext4_mark_inode_dirty(handle, inode);
2022                 if (IS_SYNC(inode))
2023                         ext4_handle_sync(handle);
2024         }
2025         ext4_journal_stop(handle);
2026         return err;
2027 }
2028
2029 int ext4_convert_inline_data(struct inode *inode)
2030 {
2031         int error, needed_blocks, no_expand;
2032         handle_t *handle;
2033         struct ext4_iloc iloc;
2034
2035         if (!ext4_has_inline_data(inode)) {
2036                 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
2037                 return 0;
2038         }
2039
2040         needed_blocks = ext4_writepage_trans_blocks(inode);
2041
2042         iloc.bh = NULL;
2043         error = ext4_get_inode_loc(inode, &iloc);
2044         if (error)
2045                 return error;
2046
2047         handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
2048         if (IS_ERR(handle)) {
2049                 error = PTR_ERR(handle);
2050                 goto out_free;
2051         }
2052
2053         ext4_write_lock_xattr(inode, &no_expand);
2054         if (ext4_has_inline_data(inode))
2055                 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
2056         ext4_write_unlock_xattr(inode, &no_expand);
2057         ext4_journal_stop(handle);
2058 out_free:
2059         brelse(iloc.bh);
2060         return error;
2061 }